lib: refactor internal webidl converters #6040

Job	Run time
collect-openssl-versions	6s
Build slim tarball	2m 23s
aarch64-linux: Cache V8 build	6s
aarch64-darwin: with shared libraries	26m 33s
x86_64-darwin: with shared libraries	32m 17s
x86_64-linux: with shared libraries	27m 23s
aarch64-linux: with shared openssl_3_6 (3.6.1)	22m 56s
aarch64-linux: with shared openssl_4_0 (4.0.0)	23m 13s
aarch64-linux: with shared openssl_3_5 (3.5.5)	23m 19s
aarch64-linux: with shared openssl_1_1 (1.1.1w)	22m 48s
aarch64-linux: with shared openssl_3 (3.0.19)	23m 29s
	3h 24m 33s

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