Storages: Splitting DMFileReaderPool to reduce lock contention (#9126)

[ti-chi-bot]

This is an automated cherry-pick of #9126

What problem does this PR solve?

Issue Number: close #9125

Problem Summary:

What is changed and how it works?

Check List

Tests

• [ ] Unit test
• [ ] Integration test
• [x] Manual test (add detailed scripts or steps below)
  • Run simple queries (select max(k) from sbtest1) concurrently.
  • Time consumption unit: ms.

Concurrency	Master	This PR
1	27	25
2	28	29
4	46	46
8	72	77
16	124	97
32	232	160
64	450	327

• [ ] No code

Side effects

• [ ] Performance regression: Consumes more CPU
• [ ] Performance regression: Consumes more Memory
• [ ] Breaking backward compatibility

Documentation

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

Release note

Improve the short queries performance under high concurrency by reducing the lock contention

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JaySon-Huang, JinheLin

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/pingcap/tiflash/blob/release-7.5/OWNERS)~~ [JaySon-Huang,JinheLin] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-06-07 06:00:42.561375396 +0000 UTC m=+98796.614687313: :ballot_box_with_check: agreed by JaySon-Huang.
• 2024-06-13 13:17:10.35795841 +0000 UTC m=+643384.411270331: :ballot_box_with_check: agreed by JinheLin.

[JinheLin]

/run-integration-test