feat!: allow consumer chains to change their PSS parameters

Description

This PR introduces the ConsumerModificationProposal that allows consumer chains to change PSS parameters (e.g., topN, validatorSetCap, etc.) while a consumer chain is running.

Note that a validator that was automatically opted in on a Top N consumer chain would remain opted in even after moving to an Opt In chain.

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and please add links to any relevant follow up issues.

I have...

[x] Included the correct type prefix in the PR title
[x] Added ! to the type prefix if the change is state-machine breaking
[ ] Confirmed this PR does not introduce changes requiring state migrations, OR migration code has been added to consumer and/or provider modules
[x] Targeted the correct branch (see PR Targeting)
[ ] Provided a link to the relevant issue or specification
[ ] Followed the guidelines for building SDK modules
[ ] Included the necessary unit and integration tests
[ ] Added a changelog entry to CHANGELOG.md
[ ] Included comments for documenting Go code
[ ] Updated the relevant documentation or specification
[ ] Reviewed "Files changed" and left comments if necessary
[ ] Confirmed all CI checks have passed
[ ] If this PR is library API breaking, bump the go.mod version string of the repo, and follow through on a new major release

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add your handle next to the items reviewed if you only reviewed selected items.

I have...

[ ] confirmed the correct type prefix in the PR title
[ ] confirmed ! the type prefix if the change is state-machine breaking
[ ] confirmed this PR does not introduce changes requiring state migrations, OR confirmed migration code has been added to consumer and/or provider modules
[ ] confirmed all author checklist items have been addressed
[ ] reviewed state machine logic
[ ] reviewed API design and naming
[ ] reviewed documentation is accurate
[ ] reviewed tests and test coverage

Summary by CodeRabbit

New Features
- Introduced a new governance proposal type, ConsumerModificationProposal, allowing modifications to parameters of a running consumer chain.
- Added functionality to handle and submit consumer modification proposals, including JSON parsing and validation.
Bug Fixes
- Added error handling for invalid consumer modification proposals.
Tests
- Implemented comprehensive test cases for the new ConsumerModificationProposal to ensure proper validation and functionality.
Documentation
- Updated documentation to reflect new proposal type and related functionalities.

[!NOTE] Currently processing new changes in this PR. This may take a few minutes, please wait...

Commits
Files that changed from the base of the PR and between e0775d92395fa88915edeaeaf634484bf8af7fa3 and 1c62d65d50b2d1ae9a87b35870d0113d8f0169ac.

Files selected for processing (2)
* x/ccv/provider/types/proposal.go (4 hunks) * x/ccv/provider/types/proposal_test.go (2 hunks)
 ____________________________________________________________________________________________________________________________________
< Put abstractions in code, details in metadata. Program for the general case, and put the specifics outside the compiled code base. >
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Walkthrough

The recent changes introduce a new proposal type, ConsumerModificationProposal, to the interchain security provider module. This proposal allows for governance-based modifications of parameters for running consumer chains, including validator settings and allow/deny lists. The changes span multiple files, adding new message types, handlers, validation functions, and test cases to support this functionality.

Changes

Files	Change Summaries
`proto/.../provider/v1/provider.proto`	Added `ConsumerModificationProposal` message with fields for modifying consumer chain parameters.
`x/ccv/provider/client/proposal_handler.go`	Introduced handler, command, and JSON parsing for `ConsumerModificationProposal`.
`x/ccv/provider/keeper/proposal.go`	Added `HandleConsumerModificationProposal` function to manage proposal processing.
`x/ccv/provider/keeper/proposal_test.go`	Added tests for `HandleConsumerModificationProposal` function.
`x/ccv/provider/proposal_handler.go`	Updated `NewProviderProposalHandler` to include `ConsumerModificationProposal`.
`x/ccv/provider/types/codec.go`	Registered `ConsumerModificationProposal` with the `InterfaceRegistry`.
`x/ccv/provider/types/errors.go`	Added `ErrInvalidConsumerModificationProposal` error.
`x/ccv/provider/types/proposal.go`	Added `ConsumerModificationProposal` type, functions, and validations.
`x/ccv/provider/types/proposal_test.go`	Added test cases for `ConsumerModificationProposal` validation functions.

Sequence Diagram(s) (Beta)

sequenceDiagram
    participant Governance
    participant ProposalHandler
    participant Keeper
    participant ConsumerChain

    Governance->>ProposalHandler: Submit ConsumerModificationProposal
    ProposalHandler->>Keeper: HandleConsumerModificationProposal
    Keeper->>ConsumerChain: Update Parameters (top_N, validators_power_cap, etc.)
    ConsumerChain->>Keeper: Confirmation of Updates
    Keeper->>ProposalHandler: Proposal Processed
    ProposalHandler->>Governance: Proposal Result

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cosmos / interchain-security