net: add synchronous, role-neutral net.BoundSocket #8232

Job	Run time
Build slim tarball	1m 11s
aarch64-linux: Cache V8 build	20s
x86_64-darwin: with shared libraries	39m 3s
aarch64-darwin: with shared libraries	22m 46s
x86_64-linux: with shared libraries	26m 57s
aarch64-linux: with shared openssl-3.0.20	23m 39s
aarch64-linux: with shared openssl-3.6.2	23m 26s
aarch64-linux: with shared openssl-4.0.0	23m 37s
aarch64-linux: with shared boringssl-0.20260526.0	23m 42s
aarch64-linux: with shared openssl-1.1.1w	22m 57s
aarch64-linux: with shared openssl-3.5.6	24m 19s
	3h 51m 57s

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