Move token checking process to server-side

[craigp-atw]

Moved tokenize and checking process to the server-side. Converted to an API call that returns an array/structure of tokens.

Added 'Check' button to prevent constant API requests.

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[longrunningprocess]

after further thought and a little research, I guess the trade-off on the async pipe is to either have two separate calls or a condition inside the one that will determine whether it received a Promise or not. If you don't foresee a situation where the sequence of an async call and sync call don't conflict, then this solution will work but putting the condition inside pipe will help avoid such a conflict should it arise in the future.

[craigp-atw]

after further thought and a little research, I guess the trade-off on the async pipe is to either have two separate calls or a condition inside the one that will determine whether it received a Promise or not. If you don't foresee a situation where the sequence of an async call and sync call don't conflict, then this solution will work but putting the condition inside pipe will help avoid such a conflict should it arise in the future.

I had tried only using the async pipe, but it caused a function in case_frame to fail (see below), because it returned a Promise instead of the expected value. I could have changed check_case_frames() to become async, but that would have an unnecessary ripple effect throughout the whole rule system.