feat: Allow const enums

[duncanbeevers]

🐸 const & readonly string arrays can't be used in schemas

const statuses = ['pending', 'downloading', 'processing', 'complete'] as const;
Types.enum(statuses);
// Argument of type 'readonly ["pending", "downloading", "processing", "complete"]'
// is not assignable to parameter of type 'unknown[]'.

🍒 Easy fix

Since schemas aren't mutated, Types.enum can accept readonly enums

[avaly]

Fix the new lint warnings.

Have you tested this change in our private repo?

[duncanbeevers]

Fix the new lint warnings.

👍

Have you tested this change in our private repo?

Yes.