feat: implement the LogStoreRawEntryReader and RawEntryReaderFilter

[WenyXu]

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Refer to a related PR or issue link (optional)

#4026

What's changed and what's your intention?

1. Implement the LogStoreRawEntryReader, which reads undecoded raw WAL entries from the underlying LogStore implementation.
2. Implement the RawEntryReaderFilter

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

[codecov]

Codecov Report

Attention: Patch coverage is 69.23077% with 48 lines in your changes are missing coverage. Please review.

Project coverage is 85.13%. Comparing base (466f7c6) to head (76121ab).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4030      +/-   ##
==========================================
- Coverage   85.43%   85.13%   -0.30%     
==========================================
  Files         980      983       +3     
  Lines      170221   170493     +272     
==========================================
- Hits       145423   145151     -272     
- Misses      24798    25342     +544     

[v0y4g3r]

LGTM