security: disable plugin in default and persist file in specified dir (#7087)

[ti-chi-bot]

This is an automated cherry-pick of #7087

What problem does this PR solve?

Issue Number: Close #7094

What is changed and how does it work?

• Load plugin and persist file in specified dir [config data dir]
• Judge persist file name rather than delete this interface to keep compatible
• Support a config to decide whether to enable the plugin

Check List

Tests

• Unit test

Release note

Add compile configuration to enable `Load Plugin` and disable `Load Plugin` by default. Need to `make pd-server-plugin` when want to enable plugin

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• nolouch
• rleungx

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[HuSharp]

@nolouch @rleungx PTAL, thx!

[codecov]

Codecov Report

Patch coverage is 31.81% of modified lines.

Files Changed	Coverage
server/api/admin.go	ø
server/handler.go	0.00%
server/api/plugin_disable.go	20.00%
server/server.go	33.33%
server/util.go	42.85%
server/replication/replication_mode.go	100.00%

📢 Thoughts on this report? Let us know!.

[CabinfeverB]

/merge

[ti-chi-bot]

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[ti-chi-bot]

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

Commit hash: a14c694