[ML] Transforms add range support for filter aggregations

[hendrikmuhs]

The transform UI support for filter aggregation allows bool, terms and exists queries, however filter supports to specify any query:

Adding generic query support might be too exotic, but it seems to me we should add at least range as this is quite useful, e.g. for response code.

As for generic queries: Could a text mention advanced cases can be implemented using the editor and/or can the filter docs be linked?

[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[peteharverson]

The Transform wizard already supports the range filter for numeric or date time field, and to make it clear that a transform can also support more complex aggregation use cases beyond the UI controls, #108720 has added extra help text for 7.16.0 to direct usage towards the JSON editor if needed.