Allow casting fields to a string

[travjenkins]

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We have an advanced feature to cast fields as strings.

Would like to add a simple single click toggle in the UI within Field Selection to 'Cast Field as String'.

Notes

Not all materializations/connectors supports this. There is no schema for this to indicate what it can handle. Not all connectors handle the same input and have the same capabilities.

A full fledged feature we need to make this a part of resource config (maybe) OR have the connector returning an actual schema to explain how/what they support.

We could add a quick "advanced spec editor" for the collection where the user manually enters a schema.

Support of this is not documented right now. Also, it is changing A LOT and QUICKLY.

This will be part of the Resource Config so that connectors that don't support this they can just ignore it. This might feel odd being there but we probably won't regret it.