GROOVY-6526: annotations: compute allowed targets lazily

[eric-milles]

Move target checking from vmplugin to ast node. Only compute once per annotation type.

If this is okay, retention policy will follow.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 77.41935% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.7537%. Comparing base (7d8349c) to head (c07e93d).

Files with missing lines	Patch %	Lines
...n/java/org/codehaus/groovy/ast/AnnotationNode.java	73.5849%	9 Missing and 5 partials ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##               master      #2388        +/-   ##
==================================================
- Coverage     66.7571%   66.7537%   -0.0034%     
- Complexity      29856      29866        +10     
==================================================
  Files            1382       1382                
  Lines          116130     116097        -33     
  Branches        20471      20469         -2     
==================================================
- Hits            77525      77499        -26     
+ Misses          32275      32269         -6     
+ Partials         6330       6329         -1     

Files with missing lines	Coverage Δ
...rg/codehaus/groovy/ast/decompiled/Annotations.java	89.8551% <ø> (-0.1449%)	⬇️
...org/codehaus/groovy/classgen/ExtendedVerifier.java	96.1373% <ø> (+4.2345%)	⬆️
...in/java/org/codehaus/groovy/vmplugin/VMPlugin.java	12.5000% <100.0000%> (+5.8333%)	⬆️
.../java/org/codehaus/groovy/vmplugin/v16/Java16.java	56.0000% <ø> (-3.2593%)	⬇️
...in/java/org/codehaus/groovy/vmplugin/v8/Java8.java	76.0135% <100.0000%> (-1.6991%)	⬇️
...in/java/org/codehaus/groovy/vmplugin/v9/Java9.java	59.7222% <ø> (-0.5517%)	⬇️
...tracts/ast/visitor/AnnotationProcessorVisitor.java	89.0909% <ø> (-0.1948%)	⬇️
...n/java/org/codehaus/groovy/ast/AnnotationNode.java	69.9029% <73.5849%> (-1.9281%)	⬇️

... and 4 files with indirect coverage changes

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