Support an alias for a bunch of annotations

[hyangtack]

Motivation:
A user may want to define his or her annotations as a custom annotation in order to apply the custom annotation to his or her annotated HTTP services. e.g:

// Define a custom annotation:
@ProducesJson
@LoggingDecorator
@interface MyApiSpecification {}

// Apply it to the annotated HTTP service:
@Get("/api")
@MyApiSpecification
public Something getSomething() {}

Modifications:

• Add AnnotationUtil for finding a specific annotation or getting all annotations from an AnnotatedElement.
• Use AnnotationUtil instead of ReflectionUtils.getAllAnnotations(). The old one does not respect the order of the annotations because its return type is a Set<Annotation> (more specifically it's HashSet).

Result:

• Won't depend on the ReflectionUtils's implementation when getting annotations.
• Closes Support an alias for a bunch of annotations  #1224

[codecov]

Codecov Report

Merging #1560 into master will increase coverage by 0.03%.
The diff coverage is 90.44%.

@@             Coverage Diff              @@
##             master    #1560      +/-   ##
============================================
+ Coverage     72.56%   72.59%   +0.03%     
- Complexity     7353     7360       +7     
============================================
  Files           684      685       +1     
  Lines         29714    29769      +55     
  Branches       3616     3628      +12     
============================================
+ Hits          21562    21612      +50     
- Misses         6267     6271       +4     
- Partials       1885     1886       +1

Impacted Files	Coverage Δ	Complexity Δ
...ternal/annotation/AnnotatedHttpServiceFactory.java	82.55% <87.69%> (+0.61%)	78 <35> (-28)	⬇️
...rp/armeria/internal/annotation/AnnotationUtil.java	92.39% <92.39%> (ø)	43 <43> (?)
...meria/internal/AbstractHttp2ConnectionHandler.java	83.33% <0%> (-6.67%)	11% <0%> (-1%)
...necorp/armeria/client/ClientDecorationBuilder.java	96.29% <0%> (-3.71%)	14% <0%> (-1%)
.../linecorp/armeria/client/Http1ResponseDecoder.java	58.18% <0%> (-1.82%)	22% <0%> (-1%)
...corp/armeria/common/stream/FixedStreamMessage.java	89.28% <0%> (-1.79%)	22% <0%> (-1%)
...p/armeria/common/stream/DeferredStreamMessage.java	82.2% <0%> (-1.7%)	31% <0%> (-1%)
...com/linecorp/armeria/server/HttpServerHandler.java	76.41% <0%> (-0.88%)	73% <0%> (-1%)
...om/linecorp/armeria/client/HttpSessionHandler.java	60.34% <0%> (-0.87%)	28% <0%> (-1%)
...inecorp/armeria/server/grpc/ArmeriaServerCall.java	82.42% <0%> (-0.79%)	74% <0%> (-2%)
... and 13 more

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[minwoox]

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