[processor/transform] Add AND and OR capability to WHERE condition

[TylerHelmuth]

Is your feature request related to a problem? Please describe.
The transform processor currently accepts a WHERE clause with a single condition:

set(name, "test") where name != "test"

But there are times where multiple conditions are needed in order to filter to the correct data.

Describe the solution you'd like
The processor's grammar should be updated to allow ANDing and ORing together any number of conditions. AND conditions should take precedence. Conditions should be able to be grouped using ( )

Example:
set(name, "test") where (name != "test" and attribute["test"] != "something") or resource.attribute["test"] == "something"

[TylerHelmuth]

proposed labels: priority:p2, help wanted, proc: transformprocessor

[kentquirk]

I'm intending to start working on this one this week. I have parser experience and it feels like a place I can help fairly quickly.

[TylerHelmuth]

@kentquirk how are things coming along? Are you still able to work on this?

[kentquirk]

Yes. I apologize -- I had forgotten I was going to be away all of last week. I expect to be able to work on it starting Friday.