[WIP] MSC1781: Proposal for associations for DIDs and DID names

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W3C recently approved a recommendation for Decentralized Identifiers. Human-Friendly Identifiers are explicitly out of scope of these recommendations. The DID spec notes DNS-DID, but that draft has expired. Solutions to this are forthcoming.

In light of #2787, I have two thoughts:

1. DIDs proper should be used as the "canonical" identifier that is "portable" in the sense of MSC2787: Portable Identities #2787. Meanwhile, human-readable aliases should either be handled by the client, which can configure its own DID mapping solution, or this should be integrated into the Matrix Identity Service API.
2. Maybe this MSC should be put on hold until W3C recommends a solution for mapping human-readable identifiers to DIDs. In the meantime, clients can simply use the DID proper for identification.