[REQUEST] RegexValueProvider to produce some debug messages

[yasonk]

When using RegexValueProvider:

- implementation: nodestream.interpreting:Interpreter
  arguments:
    interpretations:
    - type: source_node
      node_type: MyNode
      key:
        node_name: !regex
          regex: 'name: (?P<node_name>.*)'
          data: !jmespath 'record'
          group: node_name

Any issues with Regex or Data are difficult to debug.

In debug mode, it would be helpful to produce information about the regex, the text, and matches that are being produced by the regex.