feat(misconf): support of selectors for all providers for Rego

[nikpivkin]

Description

This will allow specifying selectors for all providers.

Fixes #6911

For example:

# METADATA
# title: "Test"
# scope: package
# schemas:
# - input: schema["cloud"]
# custom:
#   id: TEST001
#   avd_id: TEST001
#   severity: LOW
#   input:
#     selector:
#     - type: cloud
#       subtypes:
#         - service: compute
#           provider: google

package user.test001

import rego.v1

deny contains res if {
    some instance in input.google.compute.instances
    instance.name.value == "my-instance"
    res := result.new("deny", instance.name)
}

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).

[simar7]

nit: Do we need this to be an init func? The abstraction into the providers package is nice but IMO not at the cost of keeping an init func. I usually try to avoid having init funcs as they can get a bit problematic.

[nikpivkin]

fixed: 9d2240a