(feat) Add OFAC list check

Walkthrough

The changes introduce an OfacChecker to the chainClient, enhancing its functionality to verify addresses against the OFAC blacklist. The NewChainClient function is updated to check if an address is blacklisted upon initialization. Modifications are made to the BuildGenericAuthz and BuildExchangeAuthz methods to include checks for the granter's address. A new test function, TestOfacList, is added to validate the OFAC list handling. Additionally, an example program for downloading the OFAC list is introduced, along with a new JSON file containing blacklisted addresses.

Changes

Files	Change Summary
`client/chain/chain.go`, `client/chain/ofac.go`	Introduced `OfacChecker` struct and integrated OFAC checks into `chainClient` methods and initialization logic.
`client/chain/chain_test.go`	Added `OfacTestSuite` with `TestOfacList` to validate OFAC list handling and ensure proper error handling for blacklisted addresses.
`examples/chain/ofac/1_DownloadOfacList/example.go`	Created a Go program to download the OFAC list using the `chainclient` module.
`client/metadata/ofac.json`	Added a JSON file containing blacklisted Ethereum addresses for compliance checks.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant ChainClient
    participant OfacChecker

    User->>ChainClient: Initialize with address
    ChainClient->>OfacChecker: Check if address is blacklisted
    OfacChecker-->>ChainClient: Return blacklist status
    ChainClient-->>User: Proceed or return error

🐇 In the code we trust,
With checks that are a must,
OFAC's list we now embrace,
Ensuring compliance in our space.
With each address we verify,
No blacklisted ones slip by!
Hooray for security, hip-hip-hooray! 🎉

Recent review details

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Commits

Files that changed from the base of the PR and between a68a1a38a2afc65ac43b953eff4d847c78d1e2a3 and 0d5726e9b91c354ac514df4ef396cf7bf1ca5f76.

Files selected for processing (5)

* client/chain/chain.go (5 hunks) * client/chain/chain_test.go (3 hunks) * client/chain/ofac.go (1 hunks) * client/metadata/ofac.json (1 hunks) * examples/chain/ofac/1_DownloadOfacList/example.go (1 hunks)

Files skipped from review as they are similar to previous changes (4)

* client/chain/chain_test.go * client/chain/ofac.go * client/metadata/ofac.json * examples/chain/ofac/1_DownloadOfacList/example.go

Additional comments not posted (1)

client/chain/chain.go (1)
`324-324`: **LGTM!** The changes to initialize the `ofacChecker` and check if the account's address is blacklisted in the `NewChainClient` function are approved. This enhances the security by preventing the creation of a chain client for blacklisted addresses. Also applies to: 445-459

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InjectiveLabs / sdk-go