Possibility to request for ACLs before topic's creation

# What is currently missing?

As a klaw user I would like to request for topic creation with ACLs. That way I could avoid scenario:
- request for topic creation
- wait for approval
- request for ACLs
- wait for approval
- ready to use

# How could this be improved?

Add possibility to create ACLs request for requested but not created yet topic.

# Is this a feature you would work on yourself?

no

The issue names no files, tests, or entry points. Start by tracing the existing topic-creation and ACL-request workflows, then verify that ACL requests for pending topics are handled through approval and can support the intended request sequence.

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