[Flyte][1][IDL] Binary IDL With MessagePack

[Future-Outlier]

Tracking issue

#5318

Why are the changes needed?

Tell others how to Bianry IDL, MessagePack as an example.

What changes were proposed in this pull request?

Add comments.

How was this patch tested?

flyte backend: #5744
flytekit: flyteorg/flytekit#2751

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.30%. Comparing base (0eaa20e) to head (1ceb65b).
Report is 157 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5751      +/-   ##
==========================================
+ Coverage   35.42%   36.30%   +0.87%     
==========================================
  Files        1208     1305      +97     
  Lines      105156   109997    +4841     
==========================================
+ Hits        37254    39929    +2675     
- Misses      63932    65912    +1980     
- Partials     3970     4156     +186     

Flag	Coverage Δ
unittests-datacatalog	51.37% <ø> (ø)
unittests-flyteadmin	55.62% <ø> (ø)
unittests-flytecopilot	12.17% <ø> (ø)
unittests-flytectl	62.26% <ø> (+0.04%)	⬆️
unittests-flyteidl	7.12% <ø> (ø)
unittests-flyteplugins	53.35% <ø> (ø)
unittests-flytepropeller	41.88% <ø> (ø)
unittests-flytestdlib	55.19% <ø> (?)

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