refactor: Remove usages of the old storage crate

[evenyag]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

This PR removes the storage crate from other crates' dependency lists. The real storage engine is mito2.

It moves the BufferedWriter to the common-datasource crate so COPY TO can use it to write parquet files. Now COPY TO calls stream_to_parquet() directly.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.

Refer to a related PR or issue link (optional)

[codecov]

Codecov Report

Merging #2777 (1e975f9) into develop (d9eeeee) will decrease coverage by 1.49%.
Report is 2 commits behind head on develop.
The diff coverage is 57.77%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2777      +/-   ##
===========================================
- Coverage    85.53%   84.05%   -1.49%     
===========================================
  Files          783      722      -61     
  Lines       127088   113259   -13829     
===========================================
- Hits        108711    95197   -13514     
+ Misses       18377    18062     -315