Add "cause based" alerts for limitador

[R-Lawton]

WHAT
Create cause-based alerts for the limitador

The tabletop scenarios can be used as inspiration for the alerts

DONE
Create alerts for different scenarios for limitador
Create Promtool unit tests for each new alert

[david-martin]

@alexsnaps Tagging you on this as an fyi, in case you weren't aware of it.
We created this issue (and similar for other components) to provide some example alerts for the limitador component.
The release was initially set as v1, but since I don't know if this has been prioritised by you or others more familiar with limitador, I set it as v1.2+ instead for now (I can't unset it).

If you need any help on constructing the prometheus queries for what you think are good alerts for limitador, or help on how to construct the alert rules, please do reach out to myself or @R-Lawton .

There are examples of alert rules in here.