Allow assignment of security_group_rule to multiple security_group objects

[cdorros]

The work done here to create the new security_group_rule type is hugely appreciated - solved many cycle issues I was having:
#1620

It would be extremely useful to be able to assign security_group_rules to multiple security_groups, to allow for re-use. Additionally, inverting the assignment by allowing an array of security_group_rules to be defined in the security_group object, instead of the current behavior (assigning security_group ID to security_group_rule).

Title is related to #3525, but the content of that ticket is not what I'm after.

[phinze]

Hi @cdorros - definitely understand the desire to allow for security_group_rule reuse. Consolidating the conversation around this down in #2081. 👍

[ghost]

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