meta_storage: support delete interface

[HuSharp]

What problem does this PR solve?

Issue Number: Ref #5851, tikv/tikv#14484

What is changed and how does it work?

This PR adds the basic delete function
Here is the proto definition: https://github.com/pingcap/kvproto/pull/1226

mysql> CREATE RESOURCE GROUP IF NOT EXISTS rg1 RU_PER_SEC = 500 BURSTABLE;
Query OK, 0 rows affected (0.16 sec)

mysql> SELECT * FROM information_schema.resource_groups;
+---------+------------+----------+-----------+-------------+------------+
| NAME    | RU_PER_SEC | PRIORITY | BURSTABLE | QUERY_LIMIT | BACKGROUND |
+---------+------------+----------+-----------+-------------+------------+
| default | UNLIMITED  | MEDIUM   | YES       | NULL        | NULL       |
| rg1     | 500        | MEDIUM   | YES       | NULL        | NULL       |
+---------+------------+----------+-----------+-------------+------------+
2 rows in set (0.00 sec)

mysql> DROP RESOURCE GROUP IF EXISTS rg1;
Query OK, 0 rows affected (0.15 sec)

mysql> SELECT * FROM information_schema.resource_groups;
+---------+------------+----------+-----------+-------------+------------+
| NAME    | RU_PER_SEC | PRIORITY | BURSTABLE | QUERY_LIMIT | BACKGROUND |
+---------+------------+----------+-----------+-------------+------------+
| default | UNLIMITED  | MEDIUM   | YES       | NULL        | NULL       |
+---------+------------+----------+-----------+-------------+------------+
1 row in set (0.00 sec)

Check List

Tests

• Manual test (add detailed scripts or steps below)

Release note

meta_storage: support delete interface

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• JmPotato
• nolouch

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PR needs rebase.

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[codecov]

Codecov Report

Merging #7096 (492fd2b) into master (d21c626) will decrease coverage by 0.10%.
The diff coverage is 28.57%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7096      +/-   ##
==========================================
- Coverage   73.52%   73.42%   -0.10%     
==========================================
  Files         432      432              
  Lines       47915    47937      +22     
==========================================
- Hits        35229    35199      -30     
- Misses       9645     9684      +39     
- Partials     3041     3054      +13     

Flag	Coverage Δ
unittests	73.42% <28.57%> (-0.10%)	⬇️

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[HuSharp]

/merge

[ti-chi-bot]

@HuSharp: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 492fd2b