refactor: replace common package with pkg

[skosito]

Description

Its a big PR, but the only place to review is common package renaming to pkg and split into subpackages (couple of files like commands, version and constant are still in pkg package).
Because of this split, i also did the same for common proto files, now called pkg too.

Best way to review this is to check it out locally and check proto and pkg files, eg. if organization in subpackages in ok, if naming of subpackages is ok etc - the rest of the changes are just fixing imports (apart from proof test which i will flag in the comment).

Closes: #1905

Type of change

Refactor

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Include instructions and any relevant details so others can reproduce.

• Tested CCTX in localnet
• Tested in development environment
• Go unit tests
• Go integration tests
• Tested via GitHub Actions

Checklist:

• I have added unit tests that prove my fix feature works

[codecov]

Codecov Report

Attention: Patch coverage is 63.63636% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 51.92%. Comparing base (2b77e0b) to head (fcc1383).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1936      +/-   ##
===========================================
- Coverage    52.12%   51.92%   -0.21%     
===========================================
  Files          235      235              
  Lines        13347    13347              
===========================================
- Hits          6957     6930      -27     
- Misses        5953     5982      +29     
+ Partials       437      435       -2     

Files	Coverage Δ
pkg/authz/authz_tx_types.go	100.00% <ø> (ø)
pkg/chains/address.go	100.00% <ø> (ø)
pkg/chains/bitcoin.go	100.00% <ø> (ø)
pkg/chains/chain.go	96.69% <ø> (ø)
pkg/chains/chain_id.go	100.00% <ø> (ø)
pkg/chains/chains.go	100.00% <ø> (ø)
pkg/chains/conversion.go	100.00% <ø> (ø)
pkg/coin/coin.go	100.00% <ø> (ø)
pkg/crypto/tss.go	82.60% <100.00%> (ø)
pkg/gas/gas_limits.go	100.00% <ø> (ø)
... and 6 more

... and 30 files with indirect coverage changes

[lumtis]

It seems most of the content in cosmos.go is unused and can be removed (you can see those with Goland for ex)
I might even think this package is not needed anymore but removing it might be higher than the scope of this PR

[skosito]

@lumtis regarding cosmos package, i removed unused and replaced some usages to use sdk types directly dcb3b5a

only thing left in cosmos package are some legacybech32 methods, i thought to maybe leave them there instead of having legacy package imported on couple of places, and we can maybe open issue to replace those deprecated methods with proper ones?

[lumtis]

only thing left in cosmos package are some legacybech32 methods, i thought to maybe leave them there instead of having legacy package imported on couple of places, and we can maybe open issue to replace those deprecated methods with proper ones?

This sounds good to me