[bisq-network/bisq] Add mediation support (#3221)

[Devin Bileck]

Also while testing the above mentioned upgrade scenarios, I am seeing the following after they update, not sure if it is a concern:
```
Sep-10 23:52:42.719 [JavaFX Application Thread] ERROR bisq.common.proto.ProtoUtil: Invalid value for enum MediationResultState: PB_ERROR_MEDIATION_RESULT
Sep-10 23:52:42.720 [JavaFX Application Thread] ERROR bisq.common.proto.ProtoUtil: We try to lookup for an enum entry with name 'UNDEFINED' and use that if available, otherwise the enum is null. enum=null
```

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