docs:RFC for keyspace

[ystaticy]

Signed-off-by: ystaticy y_static_y@sina.com

What problem does this PR solve?

Issue Number: ref #40425

Problem Summary:

What is changed and how it works?

Check List

Tests

Release note

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None

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.2399%. Comparing base (341503b) to head (16d9467).
Report is 191 commits behind head on master.

❗ Current head 16d9467 differs from pull request most recent head bb2efa7

Please upload reports for the commit bb2efa7 to get more accurate results.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #39685        +/-   ##
================================================
+ Coverage   72.4329%   81.2399%   +8.8069%     
================================================
  Files          1491       2638      +1147     
  Lines        428997     717923    +288926     
================================================
+ Hits         310735     583240    +272505     
- Misses        99002     111483     +12481     
- Partials      19260      23200      +3940     

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