feat(codec): add new codec with proto requests/responses support

[rustatian]

Reason for This PR

• Add new codec support

Description of Changes

• Add support for the CODEC_PROTO with number 0x80 in the protocol frame

License Acceptance

By submitting this pull request, I confirm that my contribution is made under
the terms of the MIT license.

PR Checklist

[Author TODO: Meet these criteria.]
[Reviewer TODO: Verify that these criteria are met. Request changes if not]

• All commits in this PR are signed (git commit -s) or (git commit -S).
• The reason for this PR is clearly provided (issue no. or explanation).
• The description of changes is clear and encompassing.
• Any required documentation changes (code and docs) are included in this PR.
• Any user-facing changes are mentioned in CHANGELOG.md.
• All added/changed functionality is tested.

[codecov]

Codecov Report

Merging #122 (65898f6) into master (311cfcf) will decrease coverage by 4.07%.
The diff coverage is 47.82%.

@@            Coverage Diff             @@
##           master     #122      +/-   ##
==========================================
- Coverage   59.50%   55.42%   -4.08%     
==========================================
  Files           8        9       +1     
  Lines         363      525     +162     
==========================================
+ Hits          216      291      +75     
- Misses        123      201      +78     
- Partials       24       33       +9     

Impacted Files	Coverage Δ
test/message.pb.go	36.52% <36.52%> (ø)
pkg/rpc/decoders.go	24.48% <45.45%> (+6.06%)	⬆️
pkg/rpc/encoders.go	18.18% <50.00%> (+7.07%)	⬆️
pkg/rpc/codec.go	58.77% <59.09%> (+2.04%)	⬆️
pkg/rpc/client.go	74.68% <85.18%> (+4.19%)	⬆️
internal/receive.go	80.95% <100.00%> (ø)

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