lib: refactor internal webidl converters #6003

Job	Run time
Build slim tarball	2m 34s
collect-openssl-versions	8s
aarch64-linux: Cache V8 build	5s
x86_64-linux: with shared libraries	28m 26s
aarch64-darwin: with shared libraries	23m 46s
x86_64-darwin: with shared libraries	44m 17s
aarch64-linux: with shared openssl_1_1 (1.1.1w)	23m 32s
aarch64-linux: with shared openssl_4_0 (4.0.0)	24m 46s
aarch64-linux: with shared openssl_3_6 (3.6.1)	23m 54s
aarch64-linux: with shared openssl_3_5 (3.5.5)	24m 23s
aarch64-linux: with shared openssl_3 (3.0.19)	23m 1s
	3h 38m 52s

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