Rename tm prefixed packages to cmt

[DimitrisJim]

Description

🧹 trigger inspiration #5079 (comment)

closes: #4184

Commit Message / Changelog Entry

chore: rename tm prefixed packages to cmt.

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---

Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

• 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 and Go style guide.
• Wrote unit and integration tests.
• Updated relevant documentation (docs/) or specification (x/<module>/spec/).
• Added relevant godoc comments.
• Provide a commit message to be used for the changelog entry in the PR description for review.
• Re-reviewed Files changed in the Github PR explorer.
• Review Codecov Report in the comment section below once CI passes.

[codecov-commenter]

Codecov Report

Merging #5158 (46cd4f5) into main (4bb8edd) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5158   +/-   ##
=======================================
  Coverage   79.54%   79.54%           
=======================================
  Files         189      189           
  Lines       13260    13260           
=======================================
  Hits        10548    10548           
  Misses       2292     2292           
  Partials      420      420           

Files	Coverage Δ
modules/apps/transfer/keeper/keeper.go	93.15% <100.00%> (ø)
modules/apps/transfer/types/trace.go	89.85% <100.00%> (ø)
modules/core/23-commitment/types/merkle.go	68.18% <ø> (ø)
...odules/light-clients/07-tendermint/client_state.go	91.80% <100.00%> (ø)
...les/light-clients/07-tendermint/consensus_state.go	100.00% <100.00%> (ø)
modules/light-clients/07-tendermint/fraction.go	100.00% <100.00%> (ø)
modules/light-clients/07-tendermint/header.go	100.00% <100.00%> (ø)
...odules/light-clients/07-tendermint/misbehaviour.go	70.37% <100.00%> (ø)
...light-clients/07-tendermint/misbehaviour_handle.go	85.43% <100.00%> (ø)
modules/light-clients/07-tendermint/update.go	87.50% <100.00%> (ø)

[crodriguezvega]

Nice!

[chatton]

LGTM