[ISSUE #230]🍻Implement MessageExtEncoder

[mxsm]

Which Issue(s) This PR Fixes(Closes)

Fixes #230

Brief Description

How Did You Test This Change?

[codecov]

Codecov Report

Attention: Patch coverage is 11.13924% with 351 lines in your changes are missing coverage. Please review.

Project coverage is 17.30%. Comparing base (d53b0cd) to head (38ae7af).

Files	Patch %	Lines
...cketmq-common/src/common/message/message_single.rs	0.00%	174 Missing ⚠️
...q-store/src/message_encoder/message_ext_encoder.rs	23.36%	141 Missing ⚠️
rocketmq-common/src/common/message.rs	0.00%	28 Missing ⚠️
rocketmq-store/src/log_file/commit_log.rs	0.00%	5 Missing ⚠️
...ocketmq-common/src/common/message/message_batch.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #231      +/-   ##
==========================================
+ Coverage   15.14%   17.30%   +2.16%     
==========================================
  Files         146      147       +1     
  Lines        7369     7742     +373     
==========================================
+ Hits         1116     1340     +224     
- Misses       6253     6402     +149     

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