Add readonly option for TypeScript Language #778

Job	Run time
build	27s
typescript,typescript-zod,typescript-effect-schema	2m 18s
javascript,schema-javascript	52s
golang,schema-golang	1m 17s
cjson,schema-cjson	1m 21s
cplusplus,schema-cplusplus	2m 56s
flow,schema-flow	1m 48s
java,schema-java	5m 33s
python,schema-python	1m 43s
haskell,schema-haskell	8m 56s
csharp,schema-csharp,schema-json-csharp,graphql-csharp,csharp-SystemTextJson	6m 19s
json-ts-csharp	1m 46s
dart,schema-dart	1m 19s
swift,schema-swift	2m 18s
javascript-prop-types	1m 4s
ruby	52s
php	52s
scala3,schema-scala3	2m 11s
rust,schema-rust	3m 47s
kotlin,schema-kotlin,kotlin-jackson,schema-kotlin-jackson	6m 47s
objective-c	2m 39s
test-complete	1s
	57m 6s

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