Let dApps choose their Inbound ISM

[hai-kreate]

Description

For now, we use a single multi-sig ISM with pre-defined validators.
In the long run, dApps should be able to choose which ISM validates its messages.
One way to do this is for dApps to issue an authentic UTxO at its recipient address (e.g., signed by the stake key) with the ISM requirements.
A dedicated minting policy of the dApp would reference this UTxO and only issue authentic messages if the ISM requirements are met.
Relayers would index ISM requirements per this rule and build authentic transactions accordingly.

Tasks

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