*: Support generating adhoc heap profiling in svg format

[CalvinNeo]

What problem does this PR solve?

Issue Number: ref #9241 close #9250 ref #9320

Problem Summary:

What is changed and how it works?

Support generating adhoc heap profiling in svg format

1. While prof.activate is set to true, calling prof.dump will dump a heap file.
2. The heap file can be transformed into svg format with the help from jeprof.
3. TiFlash Proxy(TiKV) will embed a jeprof.in into its own code.
4. When /debug/pprof/heap?jeprof=true is called, a perl sub-process is started with perl /dev/stdin --show_byte ${tiflash_path} ${heap_file_path} --svg.
5. perl will execute the embedded script, and print the transformed svg files in stdout.

NOTE

1. jeprof.in is not released to user.
2. On some deployments, there could be insufficient privilege, so the API could fail and return to user with detailed message.
3. perl must be provided, otherwise the API could fail and return to user with detailed message.

Check List

Tests

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

Support generating adhoc heap profiling in svg format
支持生成即席的 heap profiling 的 svg 图

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [JinheLin,Lloyd-Pottiger]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-07-31 07:56:10.61651139 +0000 UTC m=+342486.896559458: ☑️ agreed by Lloyd-Pottiger.
• 2024-07-31 08:00:39.326903999 +0000 UTC m=+342755.606952088: ☑️ agreed by JinheLin.