Simplify halo plugin manager

[JohnNiang]

What type of PR is this?

/kind improvement
/area core
/area plugin
/milestone 2.12.x

What this PR does / why we need it:

This PR mainly simplifies halo plugin manager. Before this,

• we have too many repeat code from super class, which is uncessary
• we maintain plugin application context in ExtensionComponentsFinder, which is uncessary and is hard to manage
• we fire halo plugin event in halo plugin manager, which is complicated and leads to too many repeat code

This PR does:

• refactor halo plugin manager
• wrap base plugin with spring plugin which contains application context
• remove ExtensionComponentsFinder
• bridge halo plugin event and spring plugin event
• wait extensions fully deleted when stopping

Meanwhile, this PR will supersede PR #5236.

Which issue(s) this PR fixes:

Fixes #5226

Special notes for your reviewer:

Test installing, enabing, disabling, upgrading, reloading and deleting plugins.

Does this PR introduce a user-facing change?

None

[codecov]

Codecov Report

Attention: 342 lines in your changes are missing coverage. Please review.

Comparison is base (3f27f6f) 57.06% compared to head (55d7b54) 57.07%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
...plugin/DefaultPluginApplicationContextFactory.java	2.22%	176 Missing ⚠️
...rc/main/java/run/halo/app/plugin/SpringPlugin.java	0.00%	30 Missing ⚠️
.../halo/app/plugin/PluginBeforeStopSyncListener.java	4.54%	21 Missing ⚠️
.../halo/app/theme/finders/DefaultFinderRegistry.java	59.52%	15 Missing and 2 partials ⚠️
...va/run/halo/app/plugin/SpringComponentsFinder.java	6.66%	14 Missing ⚠️
...a/run/halo/app/plugin/PluginControllerManager.java	0.00%	13 Missing ⚠️
...main/java/run/halo/app/plugin/DevPluginLoader.java	23.07%	10 Missing ⚠️
...in/java/run/halo/app/plugin/HaloPluginManager.java	75.67%	7 Missing and 2 partials ⚠️
...app/plugin/DefaultSharedEventListenerRegistry.java	36.36%	6 Missing and 1 partial ⚠️
...ava/run/halo/app/plugin/PluginStartedListener.java	0.00%	6 Missing ⚠️
... and 14 more

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5251      +/-   ##
============================================
+ Coverage     57.06%   57.07%   +0.01%     
+ Complexity     3364     3327      -37     
============================================
  Files           585      587       +2     
  Lines         19185    18947     -238     
  Branches       1428     1399      -29     
============================================
- Hits          10947    10814     -133     
+ Misses         7652     7555      -97     
+ Partials        586      578       -8     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[guqing]

/approve

未见异常

[ruibaby]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: guqing, ruibaby

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

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [guqing,ruibaby]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment