[store] refactor: RaftState: cleanup open-create: separate info extraction and staet initialization

[drmingdrmer]

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Summary

[store] refactor: RaftState: cleanup open-create: separate info extraction and staet initialization

[store] refactor: add a field is_open to MetaStore and RaftState to indicate if it is opened from a previously saved state

Changelog

• Improvement

Related Issues

• FuseStore v0.1  #271
• [store] impl sled db backed raft-state-machine. #1080

[databend-bot]

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[ariesdevil]

LGTM, much clearer than before.

[codecov-commenter]

Codecov Report

Merging #1333 (dd8de6d) into master (d9daffb) will decrease coverage by 0%.
The diff coverage is 85%.

@@          Coverage Diff           @@
##           master   #1333   +/-   ##
======================================
- Coverage      72%     72%   -1%     
======================================
  Files         481     481           
  Lines       28029   28028    -1     
======================================
- Hits        20310   20308    -2     
- Misses       7719    7720    +1     

Impacted Files	Coverage Δ
fusestore/store/src/meta_service/raft_state.rs	86% <85%> (-1%)	⬇️
fusestore/store/src/meta_service/raftmeta.rs	78% <0%> (-1%)	⬇️

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[databend-bot]

CI Passed
Reviewer Approved
Let's Merge