An instance of a metadata_adapter should report its ID

[hackartisan]

optional parameters include

[adapter_type]:[host]:[port]:[path]

The combination of parameters should be unique to a given adapter, then hashed with md5 to make it more portable.

Use case example:
if we hash the IDs we can make a custom Valkyrie::Type which can cast a string like lock_token:a98sdfh98ashdf:my_id to a token, define the field as a Valkyrie::Types::Set.of(Valkyrie::Types::OptimisticLockToken), and then an application developer could just put it in the form and it'd work.
(note this use case requires more tickets)

required by #486
child of #286