Get executions for a set of rules via the REST api

We have a need to request executions for a set of rules in a single pack. According to the API docs, we can add a ?rule=rulename parameter, but this has two problems:

1. We can only specify one rule
2. We cannot specify the full ref of the rule (packname.rulename), so if there are two separate packs with the same rule name (handle-webhook, for example), we'll get executions back for multiple packs.

We have tried the following to no avail:

rule[]=rule-one&rule[]=rule-two
rule=rule-one&rule=rule-two
rule=rule-one,rule-two
rule.0=rule-one&rule.1=rule-two

This is a feature request for the following:

1. The ability to specify multiple rules when filtering executions
2. The ability to EITHER specify a pack name to filter in addition to the rules OR specify the full ref (packname.rulename) for each rule we want to filter on (obviously, the latter would be a bit more flexible - but probably also less performant).

something like:

?pack=packa&rule[]=rule-one&rule[]=rule-two

or

?rule[]=packa.rule-one&rule[]=packb.rule-two

Start with the documented action_executions_controller.get_all endpoint and its current rule query behavior. Review how execution filters are parsed and tested, then establish whether multiple rules should accept full rule references or a separate pack filter. Done means the REST API can unambiguously filter executions for the requested rules without matching same-named rules from unrelated packs.