acl: add ACL roles to event stream topic and resolve policies. #14923
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This changes adds ACL role creation and deletion to the event stream. It is exposed as a single topic with two types; the filter is primarily the role ID but also includes the role name.
While conducting this work it was also discovered that the events stream has its own ACL resolution logic. This did not account for ACL tokens which included role links, or tokens with expiry times. ACL role links are now resolved to their policies and tokens are checked for expiry correctly.
Related to #14922 and includes a modification in the RPC handler to accommodate the linked PR.
Closes #14777