executor/inspect: add config check for storage.block-cache.capacity of TiKV config (#15985)

[crazycs520]

cherry-pick #15985

What problem does this PR solve?

Add config check for storage.block-cache.capacity of TiKV config. If the total storage.block-cache.capacity more than the system 45% total memory, we should report a warning.

mysql>select * from `INSPECTION_RESULT` where rule='config' and item='storage.block-cache.capacity';
+--------+------------------------------+------+-------------+-------------+---------------+----------+---------------------------------------------------------------------------------------------------------------------------------------+
| RULE   | ITEM                         | TYPE |   INSTANCE  | VALUE       | REFERENCE     | SEVERITY | DETAILS                                                                                                                               |
+--------+------------------------------+------+-------------+-------------+---------------+----------+---------------------------------------------------------------------------------------------------------------------------------------+
| config | storage.block-cache.capacity | tikv | 172.16.5.40 | 60707443507 | < 60707443507 | warning  | There are 4 TiKV server in 172.16.5.40 node, the total 'storage.block-cache.capacity' of TiKV is more than (0.45 * total node memory) |
+--------+------------------------------+------+-------------+-------------+---------------+----------+---------------------------------------------------------------------------------------------------------------------------------------+

What is changed and how it works?

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:

Check List

• Unit test
• Manual test (add detailed scripts or steps below)

Side effects

• Performance regression
  • Consumes more CPU
  • Consumes more MEM

Release note

• Add config check for storage.block-cache.capacity of TiKV config.

[crazycs520]

/run-all-tests

[crazycs520]

/run-all-tests

[crazycs520]

/run-common-test

[lonng]

LGTM

[crazycs520]

/rebuild

[AilinKid]

LGTM