Search Criteria Support in the Web UI - Updated

[cded]

Resolves: #492
Closes #964

Adds support for Search Criteria and nested parameter fields for rules.

Updates for the previous PR: #964

stackstormSearchCrit.mp4

Open to suggestions for the UI design

[cded]

I used the triggers as placeholder suggestions for the search pattern item names but can change it to either no suggestion or item.data, item.time...

[arm4b]

Thanks, @cded, really great work with refactoring it. Some advanced rules from the https://docs.stackstorm.com/rules.html?highlight=search#advanced-comparison and #964 (review) worked nicely 👍

Just a few minor comments before merging:

1) Placeholder Suggestions

I used the triggers as placeholder suggestions for the search pattern item names but can change it to either no suggestion or item.data, item.time...

Yes, thanks for thinking about it 👍

Indeed, we don't need a placeholder suggestion in these scenarios as we don't know the nested schema for these objects so worth removing suggestions for the "Item Name *":

2) Please add a Changelog record for this PR.

https://github.com/StackStorm/st2web/blob/master/CHANGELOG.rst#added

3) Bonus task with the delete button

This looks ok:

However, with the multiple item patterns added, the delete button for search criteria might be confused with the item criteria:

If we can move the delete button somewhere to a better place that would be nice. Perhaps closer to the "Key" placeholder? Any other ideas?
If it's too involved and outside of the PR scope, - that's fine, we can skip it.

[arm4b]

That looks really nice 💯 , thanks a lot!