fix: add app version in the context in InitChain

[cmwaters]

Description

Currently, the app version is not passed into the context for InitGenesis which causes transactions that rely on the app version (or specifically the antehandler) to fail and panic.

This PR adds the app verison. It also simplifies the API around initialising, setting and getting the AppVersion

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Author Checklist

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• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
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• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
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• reviewed state machine logic
• reviewed API design and naming
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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 12.50000% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 64.31%. Comparing base (2a2347c) to head (ba0911f).

Additional details and impacted files

@@                     Coverage Diff                      @@
##           release/v0.46.x-celestia     #376      +/-   ##
============================================================
- Coverage                     64.33%   64.31%   -0.03%     
============================================================
  Files                           761      761              
  Lines                         76378    76376       -2     
============================================================
- Hits                          49139    49119      -20     
- Misses                        24463    24481      +18     
  Partials                       2776     2776              

Files	Coverage Δ
baseapp/options.go	57.62% <0.00%> (+0.96%)	⬆️
baseapp/baseapp.go	73.43% <0.00%> (ø)
baseapp/abci.go	59.44% <20.00%> (-0.50%)	⬇️

... and 2 files with indirect coverage changes