feat: replace proto sstable meta with self managed struct

[MrCroxx]

What's changed and what's your intention?

Originally we use proto to represent SstableMeta, which is unnecessary because SstableMeta is never passed by rpc call. This PR replace proto SstableMeta with self managed SstableMeta, after which we can remove SstableMeta and related proto definitions from proto file.

Additionally, new SstableMeta contains magic and version field for backward compatibility.

Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests

Refer to a related PR or issue link (optional)

[codecov]

Codecov Report

Merging #1447 (d425861) into main (8a40888) will increase coverage by 0.05%.
The diff coverage is 91.05%.

@@             Coverage Diff              @@
##               main    #1447      +/-   ##
============================================
+ Coverage     70.17%   70.22%   +0.05%     
  Complexity     2766     2766              
============================================
  Files          1028     1028              
  Lines         90065    90151      +86     
  Branches       1790     1790              
============================================
+ Hits          63201    63309     +108     
+ Misses        25973    25951      -22     
  Partials        891      891              

Flag	Coverage Δ
java	61.01% <ø> (ø)
rust	72.19% <91.05%> (+0.06%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
rust/bench/ss_bench/main.rs	0.98% <ø> (+0.01%)	⬆️
rust/common/src/config.rs	75.24% <ø> (+12.25%)	⬆️
rust/meta/src/hummock/test_utils.rs	96.42% <ø> (ø)
rust/storage/src/hummock/block_cache.rs	84.84% <0.00%> (+2.49%)	⬆️
rust/storage/src/hummock/compactor.rs	8.81% <0.00%> (ø)
rust/storage/src/hummock/error.rs	13.46% <ø> (ø)
...rc/hummock/shared_buffer/shared_buffer_uploader.rs	20.72% <0.00%> (ø)
rust/storage/src/hummock/sstable/multi_builder.rs	90.41% <ø> (ø)
rust/storage/src/hummock/test_utils.rs	80.48% <ø> (-0.24%)	⬇️
rust/storage/src/hummock/sstable/mod.rs	91.73% <94.23%> (+15.26%)	⬆️
... and 6 more

📣 Codecov can now indicate which changes are the most critical in Pull Requests. Learn more