[DNM]GC: Support keyspace level GC

[ystaticy]

What problem does this PR solve?

Issue Number: ref #51593

Problem Summary:

What changed and how does it work?

Check List

Tests

• Manual test (add detailed scripts or steps below)

1. set keyspace level gc when create Keyspace:
   1.1. create new keyspace with keyspace level gc:

   curl -H "Content-Type: application/json" -X POST -d \
   '{
       "name": "ks1",
       "config": {
           "gc_management_type": "keyspace_level_gc"
       }
   }' "http://127.0.0.1:2379/pd/api/v2/keyspaces"
   

   Get keyspace meta:

   curl "http://127.0.0.1:2379/pd/api/v2/keyspaces/ks1"
   {
       "id": 1,
       "name": "ks1",
       "state": "ENABLED",
       "created_at": 1712126594,
       "state_changed_at": 1712126594,
       "config": {
           "gc_management_type": "keyspace_level_gc"
       }
   }
   

   1.2. Start TiDB and check the etcd key
   You can see that the ETCD key of safe point and min start ts in pd is separated by Keyspace:

   1.minstartts
   /keyspaces/tidb/1/tidb/server/minstartts/1fbc785c-dada-4152-a2e7-f0534a386e6e
   
   2.saved safe point
   /keyspaces/tidb/1/tidb/store/gcworker/saved_safe_point
   
   4.gc safe point 
   /pd/7340112560849754553/keyspaces/gc_safe_point/00000001
   
   5.service safe point 
   /pd/7340112560849754553/keyspaces/service_safe_point/00000001/gc_worker
   

2. Check that PD's ETCD key remains in its original format without Keyspace set:

   1. minstartts
   /tidb/server/minstartts/f8545873-a97a-4aaf-be10-53633490b339
   
   2. saved safe point 
   /tidb/store/gcworker/saved_safe_point
   
   3. gc safe point
   /pd/7340566695597925295/gc/safe_point
   
   4. service safe point 
   /pd/7340566695597925295/gc/safe_point/service/gc_worker
   

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

Support TiDB server with different keyspace to advance GC safe point separately

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Codecov Report

Attention: Patch coverage is 48.02867% with 145 lines in your changes are missing coverage. Please review.

Project coverage is 73.9830%. Comparing base (0f0418f) to head (c543d86).
Report is 14 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #51300        +/-   ##
================================================
+ Coverage   72.4015%   73.9830%   +1.5815%     
================================================
  Files          1483       1499        +16     
  Lines        429016     434470      +5454     
================================================
+ Hits         310614     321434     +10820     
+ Misses        99108      93159      -5949     
- Partials      19294      19877       +583     

Flag	Coverage Δ
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unit	71.2173% <42.6523%> (-0.0304%)	⬇️

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Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	44.3260% <ø> (+3.1144%)	⬆️

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