Express REST server capabilities

[nastra]

Proposed Change

When introducing Views to the REST catalog it was clear that we need a way in the REST spec to signal which endpoints are being supported by a REST server. The idea of the proposal is to introduce and express server capabilities via the /config endpoint, so that clients know that it is safe to call a particular endpoint on a given REST server.

Capabilities that currently come to mind are:

• views
• vended-credentials
• remote-signing
• multi-table-commit

#9940 adds the required REST spec changes to introduce capabilities.

Proposal document

https://docs.google.com/document/d/1F1xh6SJhS-opgWRe1pPvWh01j8VHNHRocfCCFttKNf0/edit?usp=sharing

Specifications

• Table
• View
• REST
• Puffin
• Encryption
• Other