Public DIDs other than did:sov

[thiagoromanos]

Currently the only DID method allowed to be set as public is did:sov. However, any resolvable DID with a endpoint service set (for making connection invites using public DID) should be good to set as public.
The wallet object assumes that the public did is published in a indy network (using the BaseLedger to upadte the endpoint), which could not be true thinking in using a different to store the published DID.