Refactor ReactivePropertyAccessor by wrapping existing PropertyAccessor

[JohnNiang]

What type of PR is this?

/kind improvement
/area core
/area theme

What this PR does / why we need it:

This PR removes ReactivePropertyAccessor because it use AstUtils#getPropertyAccessorsToTry which is already hidden in the commit. If we upgraded to Spring Boot 3.4.0-M3, the code in ReactivePropertyAccessor would be broken.

More importantly, I believe there is one issue with the current implementation although it can resolve the reactive issue.

• The PropertyAccessor modified the process flow of SPEL

This PR provides some wrappers to wrap existing PropertyAccessor and MethodResolver to evaluate reactive return value.

Does this PR introduce a user-facing change?

None

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 87.35632% with 11 lines in your changes missing coverage. Please review.

Project coverage is 58.17%. Comparing base (6cd8dc8) to head (04f3aef).
Report is 81 commits behind head on main.

Files with missing lines	Patch %	Lines
...o/app/theme/dialect/EvaluationContextEnhancer.java	86.15%	4 Missing and 5 partials ⚠️
...n/java/run/halo/app/infra/utils/ReactiveUtils.java	83.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6686      +/-   ##
============================================
- Coverage     58.18%   58.17%   -0.02%     
- Complexity     3774     3944     +170     
============================================
  Files           651      679      +28     
  Lines         22125    23216    +1091     
  Branches       1538     1582      +44     
============================================
+ Hits          12873    13505     +632     
- Misses         8641     9087     +446     
- Partials        611      624      +13     

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[guqing]

/lgtm

[f2c-ci-robot]

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