feat: implement Puffin format

[zhongzc]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

Part of #2705

implement {sync|async} {reader|writer} for Puffin.

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 #2721 (1c3e469) into develop (0cd6dac) will decrease coverage by 0.29%.
Report is 1 commits behind head on develop.
The diff coverage is 96.55%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2721      +/-   ##
===========================================
- Coverage    85.17%   84.88%   -0.29%     
===========================================
  Files          765      775      +10     
  Lines       123940   125020    +1080     
===========================================
+ Hits        105565   106125     +560     
- Misses       18375    18895     +520     

[waynexia]

Why this is binary

[zhongzc]

only github knows

[zhongzc]

.dev works fine

[evenyag]

Why does the mod.rs occupy 8.25KB?

By the way, can we remove mod.rs? Most crates in the project don't use mod.rs:
https://doc.rust-lang.org/edition-guide/rust-2018/path-changes.html#no-more-modrs

[evenyag]

Should we create a new repo for the puffin crate? We can create a repo under our team. @waynexia @v0y4g3r

This PR is too large and I'd suggest breaking it into 3 or 4 small PRs that each is less than 1k line

• init crate and file formats
• writer
• reader
• partial reader

[evenyag]

Why does the mod.rs occupy 8.25KB?

By the way, can we remove mod.rs? Most crates in the project don't use mod.rs:
https://doc.rust-lang.org/edition-guide/rust-2018/path-changes.html#no-more-modrs

[zhongzc]

Why does the mod.rs occupy 8.25KB?

It's average. 40B/line * 200lines = 8KB

can we remove mod.rs?

Sure.

Should we create a new repo for the puffin crate

We can move out when the implementation becomes more mature and stable. Multiple repos will affect development efficiency.

breaking it into 3 or 4 small PRs

good suggestion

[v0y4g3r]

Maybe we should create a puffin-rs crate?

[zhongzc]

Maybe we should create a puffin-rs crate?

Do you mean creating a new repo?