Title: Use type URL for cluster factories

Description:

from #36353. We want to use type URL instead of names for cluster factories. That is refactor the following code

This is somewhat complex some cluster types (original dst, static), don't have type URLs, so we're probably going to need to create placeholder protos for them.

There is also a question for how much backcompatibility we want to preserve. For example, the following cluster is valid,

cluster_type:
  name: envoy.cluster.original_dst # or static
  typed_config:
    "@type": type.googleapis.com/envoy.extensions.network.dns.v3.GetAddrInfo  # or anything else, but not empty

This means that if we want to be strict about backcompatibility, we will never be able to select cluster factories purely by type_url. However, I'd be pretty surprised if anybody is using a config like the one above, since it doesn't make a lot of sense.

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