chore: add into_inner() for ICS07 ConsensusState

[Farhad-Shabani]

Description

• Adds an into_inner() method for the ICS07 ConsensusState, so that dependent projects won't need to perform redundant cloning.
• Removes redundant cloning within the IC07 check_substitute implementation.

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PR author checklist:

• Added changelog entry, using unclog.
• 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: Patch coverage is 0% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 63.84%. Comparing base (d4c3655) to head (c579628).

Files	Patch %	Lines
...ts/ics07-tendermint/src/client_state/validation.rs	0.00%	6 Missing ⚠️
...bc-clients/ics07-tendermint/src/consensus_state.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1156      +/-   ##
==========================================
- Coverage   63.85%   63.84%   -0.01%     
==========================================
  Files         219      219              
  Lines       21359    21362       +3     
==========================================
  Hits        13638    13638              
- Misses       7721     7724       +3     

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[seanchen1991]

Looks good in general, just a question about the removed playground link.