add note content searching

[machineonamission]

closes #1238

adds 6 predicates of 3 types:

• system:has note that contains: searches for content that has notes which contain, anywhere in the note, the user specified content.
  • under the hood this in essence does LIKE '%word%' in sqlite
• system:has note that matches: searches for content that has notes that 100% match the user specified content
  • LIKE 'word'
• system:has note that contains the words: searched for content that has notes which contain, in any order, each word the user specifies.
  • uses some python to preprocess, but results in essentially LIKE '%word1%' AND LIKE '%word2%' AND LIKE '%word3%' ....

each of these predicates has a corresponding "not" predicate that searches for stuff that DOESN'T match it.

all inputs intentionally support the sqlite LIKE special characters: % matches 0+ characters (like regex *) and _ matches one character (like regex .). the user can escape these with \. wasnt sure how to communicate this. i like this choice because, without any special characters, LIKE behaves exactly like =.

I also added GUI under the system:notes popup for these

perhaps, in the future, a more comprehensive search like FTS5 could be implemented, but this requires changes to the underlying database (adding virtual tables that sqlite manages to help index search), so I didn't do that for this.

I tried my best to match your code style (had to do a lot of configuring to get the indents to work).

Tested and working on python 3.13

[machineonamission]

Maybe it would be better if i used GLOB instead of LIKE, the * syntax is more familiar, but glob is always case sensitive which is probably not desireable

[machineonamission]

i did not mean to delete that