inspector,http: support builtin http request bodies #6365

Job	Run time
Build slim tarball	1m 50s
aarch64-linux: Cache V8 build	50m 42s
x86_64-linux: with shared libraries	50m 44s
aarch64-darwin: with shared libraries	50m 51s
x86_64-darwin: with shared libraries	51m 3s
aarch64-linux: with shared ${{ matrix.openssl.name }}	1s
	3h 25m 11s

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