Extend the veramo-server createDefaultDid to support other did provider

[AlexAndrei98]

**Extend the init function to allow for other did providers outside of did:web on startup **
It would be helpful if the startup function can be extended to support different did provider for the createDefaultDid function
https://github.com/uport-project/veramo/blob/next/packages/remote-server/src/default-did.ts.

[stale]

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