Expand http2 connection window upon new stream acquisition

[zoewangg]

Description

Expand Http2 connection-level flow control window when a new stream is acquired on that connection so that the connection-level window size is proportional to the number of streams.

Testing

Add new unit test.
Will run integ/stability tests suites.

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 #1661 into master will increase coverage by 0.04%.
The diff coverage is 87.5%.

@@             Coverage Diff              @@
##             master    #1661      +/-   ##
============================================
+ Coverage     75.37%   75.41%   +0.04%     
  Complexity     1446     1446              
============================================
  Files          1057     1057              
  Lines         31501    31523      +22     
  Branches       2439     2439              
============================================
+ Hits          23743    23774      +31     
+ Misses         6568     6556      -12     
- Partials       1190     1193       +3

Flag	Coverage Δ	Complexity Δ
#unittests	75.41% <87.5%> (+0.04%)	1446 <0> (ø)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
...k/http/nio/netty/internal/ChannelAttributeKey.java	100% <100%> (ø)	0 <0> (ø)	⬇️
...nio/netty/internal/ChannelPipelineInitializer.java	98.11% <100%> (+0.07%)	0 <0> (ø)	⬇️
...ty/internal/http2/Http2MultiplexedChannelPool.java	76.75% <83.33%> (+1.01%)	0 <0> (ø)	⬇️
...ware/amazon/awssdk/utils/cache/CachedSupplier.java	87.8% <0%> (-2.44%)	0% <0%> (ø)
...ssdk/core/internal/async/FileAsyncRequestBody.java	84.76% <0%> (+0.95%)	0% <0%> (ø)	⬇️
...o/netty/internal/utils/BetterFixedChannelPool.java	64.36% <0%> (+6.32%)	0% <0%> (ø)	⬇️

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[dagnir]

nit: believe we remove all the copyright years from the license headers now (#1655)

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
No Duplication information