Implement arn parser functions

[zoewangg]

Description

Implement arn parser functions. Basically same as v1.
The only differences are:

• Add more javadocs
• Make it follow v2 pattern
• Make ArnResource return Optional<String> resourceType() and Optional<String> qualifier() since they are optional.

Testing

Same tests copied from v1. changed assertions to use assertj

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have read the CONTRIBUTING document
• Local run of mvn install succeeds
• My code follows the code style of this project
• My change requires a change to the Javadoc documentation
• I have updated the Javadoc documentation accordingly
• I have read the README document
• I have added tests to cover my changes
• All new and existing tests passed
• A short description of the change has been added to the CHANGELOG
• My change is to implement 1.11 parity feature and I have updated LaunchChangelog

License

• I confirm that this pull request can be released under the Apache 2 license

[codecov-io]

Codecov Report

Merging #1462 into master will increase coverage by 0.06%.
The diff coverage is 85.52%.

@@             Coverage Diff              @@
##             master    #1462      +/-   ##
============================================
+ Coverage     73.75%   73.82%   +0.06%     
- Complexity      684      720      +36     
============================================
  Files           848      850       +2     
  Lines         26006    26158     +152     
  Branches       1993     2018      +25     
============================================
+ Hits          19181    19310     +129     
- Misses         5963     5973      +10     
- Partials        862      875      +13

Flag	Coverage Δ	Complexity Δ
#unittests	73.82% <85.52%> (+0.06%)	720 <36> (+36)	⬆️

Impacted Files	Coverage Δ	Complexity Δ
...java/software/amazon/awssdk/utils/StringUtils.java	63.63% <100%> (+2.66%)	0 <0> (ø)	⬇️
.../java/software/amazon/awssdk/arns/ArnResource.java	83.01% <83.01%> (ø)	14 <14> (?)
...src/main/java/software/amazon/awssdk/arns/Arn.java	86.02% <86.02%> (ø)	22 <22> (?)
...o/netty/internal/http2/HttpOrHttp2ChannelPool.java	80.64% <0%> (-1.08%)	0% <0%> (ø)

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