Add user-defined token parameter to auth API

Closes https://github.com/influxdata/influxdb/issues/23230

Above issue incorrectly titled.

Comment in there is the right description of the issue: https://github.com/influxdata/influxdb/issues/23230#issuecomment-1199439851

Start with issue #23230 and the comment linked from its description, since this issue says that comment contains the actual requirements. Confirm the intended authentication API behavior and acceptance criteria there before identifying the implementation and tests; done means the requested user-defined token parameter is supported and covered by appropriate tests.

Written by the indexing model from the issue text.