Decentralized network settings management

[roman-khimov]

Is your feature request related to a problem? Please describe.

I'm always frustrated when I can't do something in a proper decentralized environment. Like settings management, we have neofs-adm that can help with it, but it requires all IR keys to be present in the same place which is dangerous and not even possible in some scenarios (imagine real independent IR nodes operated by different parties).

Describe the solution you'd like

Add control/cli (or adm, can be discussed) commands to create/send a notary request with a single key. Then add list/get/sign commands for other parties to get notary requests from pool, check their contents and add their signatures.

NeoGo has some similar things for non-notary transactions: https://github.com/nspcc-dev/neo-go/blob/master/docs/cli.md#transaction-signing but this needs to be extended and tuned for the specific use case.

Describe alternatives you've considered

None.

Additional context

#2660.

[roman-khimov]

Duplicates #2088.