feat(testkit): add store implementations in ibc-testkit

[rnbguy]

Closes: #1045

Description

This PR includes basecoin-store crate from basecoin repo inside ibc-testkit. These store implementations are only intended for testing purposes.

We plan to use these implementations to improve the coverage of our IBC tests.

---

PR author checklist:

• Added changelog entry, using unclog.
• Added tests.
• Linked to GitHub issue.
• Updated code comments and documentation (e.g., docs/).
• Tagged one reviewer who will be the one responsible for shepherding this PR.

Reviewer checklist:

• Reviewed Files changed in the GitHub PR explorer.
• Manually tested (in case integration/unit/mock tests are absent).

[codecov]

Codecov Report

Attention: 437 lines in your changes are missing coverage. Please review.

Comparison is base (ee92645) 71.30% compared to head (89a0b11) 70.34%.

Files	Patch %	Lines
ibc-testkit/store/src/impls/growing.rs	0.00%	73 Missing ⚠️
ibc-testkit/store/src/impls/in_memory.rs	0.00%	64 Missing ⚠️
ibc-testkit/store/src/impls/revertible.rs	0.00%	60 Missing ⚠️
ibc-testkit/store/src/impls/shared.rs	0.00%	46 Missing ⚠️
ibc-testkit/store/src/types/store.rs	0.00%	35 Missing ⚠️
ibc-testkit/store/src/utils/codec.rs	0.00%	35 Missing ⚠️
ibc-testkit/store/src/types/path.rs	33.33%	28 Missing ⚠️
ibc-testkit/store/src/avl/tree.rs	87.58%	19 Missing ⚠️
ibc-testkit/store/src/avl/node.rs	82.92%	14 Missing ⚠️
ibc-testkit/store/src/avl/as_bytes.rs	43.47%	13 Missing ⚠️
... and 6 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1048      +/-   ##
==========================================
- Coverage   71.30%   70.34%   -0.96%     
==========================================
  Files         187      204      +17     
  Lines       18507    19382     +875     
==========================================
+ Hits        13196    13634     +438     
- Misses       5311     5748     +437     

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[rnbguy]

@Farhad-Shabani maybe we close this PR without merging ? we decided to use basecoin-store as a remote dependency.