support fetch raft log num of each region for page-ctl

[lidezhu]

What problem does this PR solve?

Issue Number: ref #6827

Problem Summary: Support to print raft log info using page-ctl.

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  run ./tiflash pagectl -V 4 --mode 6 --path /tidb-deploy/tiflash-9000/data/page/write and check the output;

it will print many lines like the following:

region id: 8867 min_raft_log_index: 241449 max_raft_log_index: 251913 log count: 10465

• 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

None

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[JaySon-Huang]

Can we get these changes merged into the master?

[lidezhu]

Can we get these changes merged into the master?

Yes, but there is some more function to add.

[lidezhu]

/run-all-tests

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-07-20 01:29:17.43248049 +0000 UTC m=+1159449.202819190: ☑️ agreed by Lloyd-Pottiger.
• 2023-07-20 03:39:22.390979562 +0000 UTC m=+1167254.161318260: ☑️ agreed by JaySon-Huang.