rest_api: filter, exclude, transform API responses

[francescomucio]

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As per the associated issue, rest_api: Allow the REST API config object to exclude rows, columns, and transform data:

• when specifying a resource it will be possible to pass:
  • a row_filter, in the form of a function or lambda
  • a list of columns (exclude_columns), as jsonpaths, that need to be removed from the output
  • a transform, in the form of a function or lambda

I have added the additional properties to typing.py and added the code to handle them.

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