Move the fast-json-stringify-compiler to the fast-json-stringify

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### Issue

I want to move the fast-json-stringify-compiler logic to the fast-json-stringify.

Motivation: The fast-json-stringify-compiler binds external schemas to the functional context. What we can do is precompile as many things as we can: clone schemas, add schemas to the RefResolver, modify schemas for Ajv and maybe precompile serializers for those external schemas that don't depend on route schema. Now we do these operations for all external schemas each time when we build a serializer for a route. All these optimizations should be done inside the library because they are based on the implementation and not on the interface.

@Eomm @mcollina WDYT?