lib: refactor internal webidl converters #5998

Job	Run time
collect-openssl-versions	8s
Build slim tarball	1m 56s
aarch64-linux: Cache V8 build	5s
aarch64-darwin: with shared libraries	25m 37s
x86_64-darwin: with shared libraries	45m 16s
x86_64-linux: with shared libraries	29m 24s
aarch64-linux: with shared openssl_3_5 (3.5.5)	25m 53s
aarch64-linux: with shared openssl_3 (3.0.19)	23m 59s
aarch64-linux: with shared openssl_4_0 (4.0.0)	25m 31s
aarch64-linux: with shared openssl_1_1 (1.1.1w)	25m 31s
aarch64-linux: with shared openssl_3_6 (3.6.1)	25m 45s
	3h 49m 5s

Provide feedback