lib: refactor internal webidl converters #5993

Job	Run time
collect-openssl-versions	22s
Build slim tarball	2m 5s
x86_64-darwin: with shared libraries	1m 20s
x86_64-linux: with shared libraries	1m 12s
aarch64-darwin: with shared libraries	1m 13s
aarch64-linux: Cache V8 build	3s
aarch64-linux: with shared openssl_3 (3.0.19)	1m 6s
aarch64-linux: with shared openssl_3_5 (3.5.5)	1m 6s
aarch64-linux: with shared openssl_3_6 (3.6.1)	1m 3s
aarch64-linux: with shared openssl_1_1 (1.1.1w)	1m 6s
aarch64-linux: with shared openssl_4_0 (4.0.0)	1m 6s
	11m 42s

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