fix(types): infer number enum types from schema if using enum: [0, 1] as const

[vkarpov15]

Fix #12242

Summary

#12242 shows that we can do a better job of inferring enum types for numbers, like how we infer enums from strings. You do need to use as const as @hasezoey pointed out, but otherwise this approach seems to work.

Examples

[hasezoey]

LGTM _{though complex types and typescript syntax sometimes look like magic to me}

[AbdelrahmanHafez]

LGTM, thanks. 👍