WIP: send device info on first connect

[achou11]

Closes #245

As of now:

• only implements sending the device info on initial connection. does not listen for device-info events and do anything with those

Questions:

• does this live at the manager level or project instance level?

  • initially thought manager but now i'm wondering if this is project-based, because we would have the option to selectively send the device info based on whether we have local knowledge of the connected peer (which lives in the project dbs)

• what should the manager do when the rpc instance emits a device-info event?

  • are we persisting that info somewhere? e.g. in the localDeviceInfo directory

• noticing that the deviceId on the device-info payload is referring to a peer id as defined by hypercore secret stream or whatever, but deviceId in MapeoManager/MapeoProject refers to a value derived from the keyManager instance's identity keypair. is this intentional? if so, how are we supposed to use the deviceId from the device-info event?

[achou11]

Closing because I totally misunderstood the issue and this part is actually blocked on mdns work.