net: add experimental net/promises API #8151

Job	Run time
Build slim tarball	2m 36s
aarch64-linux: Cache V8 build	21s
x86_64-linux: with shared libraries	28m 15s
aarch64-darwin: with shared libraries	24m 54s
x86_64-darwin: with shared libraries	45m 49s
aarch64-linux: with shared openssl-1.1.1w	22m 53s
aarch64-linux: with shared openssl-4.0.0	23m 38s
aarch64-linux: with shared openssl-3.0.20	23m 34s
aarch64-linux: with shared openssl-3.5.6	23m 47s
aarch64-linux: with shared boringssl-0.20260526.0	2m 45s
aarch64-linux: with shared openssl-3.6.2	24m 19s
	3h 42m 51s

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