fix: determine region role by using is_readonly

[WenyXu]

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What's changed and what's your intention?

determine region role by using is_readonly

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.51%. Comparing base (f252599) to head (5ed3016).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4725      +/-   ##
==========================================
- Coverage   84.79%   84.51%   -0.28%     
==========================================
  Files        1114     1115       +1     
  Lines      200672   201200     +528     
==========================================
- Hits       170160   170053     -107     
- Misses      30512    31147     +635     

[MichaelScofield]

So region state and region role are interwind: if a region is set to "read only", then it must be a "follower". Is it expected from the aspect of design? @fengjiachun

[v0y4g3r]

It's quite subtle that a region is follower if and only if it's read-only 😢