HTTP/2 in netty-http4

[alzimmermsft]

Description

Adds support for HTTP/2 in netty-http4 following the same concept in #45758, where ALPN is the only way for HTTP/2 to be used.

This design leverages HttpToHttp2ConnectionHandler and InboundHttp2ToHttpAdapter to convert HTTP/1.1 requests to HTTP/2 frames and HTTP/2 response frames to HTTP/1.1 objects. Initially, a more complex design where netty-http4 would handle HTTP/2 request and response frames with a complete separate code path from HTTP/1.1 was tests, but a few issues were found so the simpler design was chosen. In the future, if performance is lacking, that previous design can be retried to provide a higher level of performance and the current design performs a lot of transformations.

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[Copilot]

Pull Request Overview

This pull request adds support for HTTP/2 in netty-http4 by leveraging ALPN and reusing HTTP/1.1 conversion mechanisms. Key changes include the introduction of an isHttp2 flag across several HTTP handlers and streams, renaming of HTTP headers wrappers (e.g. from WrappedHttpHeaders to WrappedHttp11Headers), and adjustments in the client builder to support HTTP/2.

Reviewed Changes

Copilot reviewed 20 out of 22 changed files in this pull request and generated 1 comment.

File	Description
sdk/parents/clientcore-parent/pom.xml	Adds a javaagent argument for TLS secret extraction.
sdk/clientcore/http-netty4/src/test/java/io/clientcore/http/netty4/implementation/*	Updates test classes and renames classes to reflect HTTP/1.1 specificity.
sdk/clientcore/http-netty4/src/main/java/io/clientcore/http/netty4/implementation/*	Introduces the isHttp2 flag in various handlers, streams, and binary data classes, and renames HTTP headers wrappers.
sdk/clientcore/http-netty4/src/main/java/io/clientcore/http/netty4/NettyHttpClientBuilder.java and NettyHttpClient.java	Modifies builder settings and client initialization to support HTTP/2.

[github-actions]

API Change Check

APIView identified API level changes in this PR and created the following API reviews

io.clientcore:http-netty4