lib: refactor internal webidl converters #6084

Job	Run time
Build slim tarball	3m 28s
collect-openssl-versions	9s
aarch64-linux: Cache V8 build	6s
x86_64-linux: with shared libraries	26m 5s
aarch64-darwin: with shared libraries	26m 47s
x86_64-darwin: with shared libraries	32m 28s
aarch64-linux: with shared openssl_1_1 (1.1.1w)	23m 6s
aarch64-linux: with shared openssl_4_0 (4.0.0)	23m 22s
aarch64-linux: with shared openssl_3_6 (3.6.1)	23m 10s
aarch64-linux: with shared openssl_3 (3.0.19)	22m 24s
aarch64-linux: with shared openssl_3_5 (3.5.5)	22m 47s
	3h 23m 52s

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