Support for word_similarity, strict_word_similarity

[pomgui]

Hi there,

Great work!

In my use case, I need other functions of the pg_trgm extension, for testing purposes, such like:

• word_similarity
• strict_word_similarity

If you could include them in your package, it would be awesome.

Or better yet: consider including all of them and create a pg-mem usable extension. (Sorry if I'm asking too much)

Thanks!