[Streams] add filters for words in title or tags

[palmtree5]

Type of feature request

Other

Description of the feature you're suggesting

To quote from a comment on #2356:

The ability to only announce streams if they have something specific in the stream title or tags would also be helpful, as an extension of this. For example, I'd like to use Red to announce people streaming for specific charities, but not all of their streams will be raising money for those charities, so the ability to filter by "Jude" or "Starlight" for St. Jude Children's Research Hospital or Starlight Children's Foundation supporting streams among the tracked list of streamers would be very helpful.

Definitely interested in looking into this as a possibility and seeing what we can do with this. Not going to put this into a milestone at this time though as the amount of work to be done will probably help decide where to put it for that

Anything else?

No response