feat!: implement expired subspace fee grant deletion

Description

This PR implements expired subspace fee grant deletion mentioned in ADR-017.

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 API or client breaking change
[x] targeted the correct branch (see PR Targeting)
[ ] provided a link to the relevant issue or specification
[ ] followed the guidelines for building 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
[x] reviewed "Files changed" and left comments if necessary
[ ] confirmed all CI checks have passed

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 ! in the type prefix if API or client breaking change
[ ] 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
[ ] manually tested (if applicable)

Codecov Report

Patch coverage: 89.47% and project coverage change: -0.46 :warning:

Comparison is base (275eee9) 80.95% compared to head (ce8ef22) 80.49%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1198 +/- ## ========================================== - Coverage 80.95% 80.49% -0.46% ========================================== Files 215 218 +3 Lines 18062 18289 +227 ========================================== + Hits 14622 14722 +100 - Misses 2829 2955 +126 - Partials 611 612 +1 ``` | [Impacted Files](https://app.codecov.io/gh/desmos-labs/desmos/pull/1198?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=desmos-labs) | Coverage Δ | | |---|---|---| | [x/subspaces/module.go](https://app.codecov.io/gh/desmos-labs/desmos/pull/1198?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=desmos-labs#diff-eC9zdWJzcGFjZXMvbW9kdWxlLmdv) | `12.58% <0.00%> (ø)` | | | [x/subspaces/types/models\_feegrant.go](https://app.codecov.io/gh/desmos-labs/desmos/pull/1198?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=desmos-labs#diff-eC9zdWJzcGFjZXMvdHlwZXMvbW9kZWxzX2ZlZWdyYW50Lmdv) | `78.57% <61.53%> (-0.38%)` | :arrow_down: | | [x/subspaces/abci.go](https://app.codecov.io/gh/desmos-labs/desmos/pull/1198?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=desmos-labs#diff-eC9zdWJzcGFjZXMvYWJjaS5nbw==) | `100.00% <100.00%> (ø)` | | | [x/subspaces/keeper/feegrant.go](https://app.codecov.io/gh/desmos-labs/desmos/pull/1198?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=desmos-labs#diff-eC9zdWJzcGFjZXMva2VlcGVyL2ZlZWdyYW50Lmdv) | `94.32% <100.00%> (+2.92%)` | :arrow_up: | | [x/subspaces/legacy/v7/store.go](https://app.codecov.io/gh/desmos-labs/desmos/pull/1198?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=desmos-labs#diff-eC9zdWJzcGFjZXMvbGVnYWN5L3Y3L3N0b3JlLmdv) | `100.00% <100.00%> (ø)` | | | [x/subspaces/simulation/decoder.go](https://app.codecov.io/gh/desmos-labs/desmos/pull/1198?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=desmos-labs#diff-eC9zdWJzcGFjZXMvc2ltdWxhdGlvbi9kZWNvZGVyLmdv) | `100.00% <100.00%> (ø)` | |

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desmos-labs / desmos