WebSockets Next: merge BlockingSender and Sender interfaces #1836

Job	Run time
CI Sanity Check	32s
Attach pull request number	0s
Initial JDK 17 Build	13m 28s
Calculate Test Jobs	9s
Maven Tests - JDK ${{ matrix.java.name }}	0s
Gradle Tests - JDK ${{ matrix.java.name }}	0s
JVM Tests - JDK 17	7m 38s
JVM Tests - JDK 21	7m 8s
Devtools Tests - JDK ${{ matrix.java.name }}	0s
Quickstarts Compilation - JDK 17	6m 20s
JVM Tests - JDK 17 Windows	12m 31s
Kubernetes Tests - JDK ${{ matrix.java.name }}	0s
Native Tests - HTTP	7m 40s
Native Tests - Virtual Thread - ${{ matrix.category }}	0s
MicroProfile TCKs Tests	0s
Upload build stats to collector	0s
Build report	2m 39s
	58m 5s

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