feat: Add bytes affine

[bsbds]

Based on: #656

Please briefly answer these questions:

• what problem are you trying to solve? (or if there's no problem, what's the motivation for this change?)

  Adds a new type BytesAffine, which defines the order of the keys.
  FYI:

• https://etcd.io/docs/v3.3/learning/api/#key-ranges
• https://github.com/etcd-io/etcd/blob/e68afe7eb7ce3e5f83deb2a8ad58faa3b35494b9/pkg/adt/interval_tree.go#L919-L947

• what changes does this pull request make?

• are there any non-obvious implications of these changes? (does it break compatibility with previous versions, etc)

[codecov]

Codecov Report

Attention: Patch coverage is 79.59184% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 75.07%. Comparing base (40763a8) to head (57bea08).
Report is 10 commits behind head on master.

Files	Patch %	Lines
crates/xlineapi/src/interval.rs	79.59%	8 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #667      +/-   ##
==========================================
- Coverage   75.18%   75.07%   -0.11%     
==========================================
  Files         175      176       +1     
  Lines       26793    26852      +59     
  Branches    26793    26852      +59     
==========================================
+ Hits        20144    20160      +16     
- Misses       5437     5479      +42     
- Partials     1212     1213       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[Phoenix500526]

LGTM，please squash these commits into one. We should remove the KeyRange in the future. Please leave an issue to track.