Serialize and restore a compiled schema

[jdesrosiers]

#110 adds the minimum that would be needed to support an application that wants to implement serializing a compiled schema. This issue would add functions to the experimental API to handle serializing and deserializing instances of CompiledSchema. The compiled schema is mostly JSON-serializable, but has two types that require an extra step: RegExp and EvaluatedPlugin.

RegExp should be easy because it can be serialized as a string, but EvaluatedPlugin is a little more complicated. We'll have to store the plugin's identifier and use that to restore the plugin. That means we'll need to build something that can take a plugin identifier and return the plugin. That can be hardcoded for builtin plugins. For custom plugins, we'll have to include an additional argument to the restore function for the user to provide their custom plugins.

[jdesrosiers]

Related to rjsf-team/react-jsonschema-form#4923

[Ahmedmhmud]

I think we can add experimental serialize and deserialize helpers for CompiledSchema using JSON.stringify and JSON.parse with a replacer and reviver.
For RegExp, we can save the source and flags, then rebuild the same RegExp when restoring.
For EvaluatedPlugin, we can save only the plugin ID. During restore, we first try to resolve that ID from the built-in plugins in the library, then from an optional pluginsById map that the user passes for custom plugins. If the plugin ID is not found in either place, we should throw a clear error. If this sounds good, I would like to work on it.

[jdesrosiers]

Go ahead