[Feature] elasticstack_kibana_alerting_rule should support all current rule types

[wandergeek]

Is your feature request related to a problem? Please describe.
We are using the provider to manage alerting rules and it appears that only certain types of rules are supported.

Describe the resource you would like to have implemented.
I would like to use terraform for alerting rules with rule_type_id equal to observability.rules.custom_threshold at a minimum, but its likely there are some other rules which are unsupported as well.

Here is an example JSON body: example.json

Describe the solution you'd like
Implement all rule types ideally, but observability.rules.custom_threshold at a minimum.