chore(feemarket) - Depreacte usage of x/params in x/feemarket

[Vvaradinov]

Deprecates the now legacy Cosmos SDK x/params usage in x/feemarket module. For more info regarding changes check out #1472

Closes: ENG-1107

Description

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For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

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For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
• Reviewers assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[linear]

ENG-1107 Deprecate Cosmos x/params logic from FeeMarket module

This is in relation to ENG-965

[codecov]

Codecov Report

Merging #1509 (e7fd485) into main (8886ce3) will decrease coverage by 0.20%.
The diff coverage is 67.85%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1509      +/-   ##
==========================================
- Coverage   68.40%   68.19%   -0.21%     
==========================================
  Files         106      110       +4     
  Lines       10077    10087      +10     
==========================================
- Hits         6893     6879      -14     
- Misses       2783     2801      +18     
- Partials      401      407       +6     

Impacted Files	Coverage Δ
x/feemarket/types/codec.go	45.45% <45.45%> (ø)
x/feemarket/keeper/keeper.go	86.66% <50.00%> (-4.64%)	⬇️
x/feemarket/types/msg.go	50.00% <50.00%> (ø)
x/feemarket/keeper/params.go	68.42% <63.63%> (-20.87%)	⬇️
x/feemarket/keeper/msg_server.go	66.66% <66.66%> (ø)
x/feemarket/migrations/v4/migrate.go	83.33% <83.33%> (ø)
app/app.go	84.90% <100.00%> (+0.02%)	⬆️
x/feemarket/keeper/migrations.go	100.00% <100.00%> (+100.00%)	⬆️
x/feemarket/types/params.go	87.69% <100.00%> (-5.42%)	⬇️
... and 2 more

[GAtom22]

Awesome work @Vvaradinov!! Left a few questions and comments, LMK your thoughts

[MalteHerrmann]

tACK! Good stuff @Vvaradinov, left some small comments

[fedekunze]

LGTM. We should improve coverage in the msg.go file

[fedekunze]

@Vvaradinov requesting some additional changes that we discussed in Slack