Add to ConnectorSpecification a Features map to declare what they support

[ChristopheDuong]

Tell us about the problem you're trying to solve

We've been adding supportsXXX flags in the ConnectorSpecification object of the Airbyte protocol:

airbyte/airbyte-protocol/models/src/main/resources/airbyte_protocol/airbyte_protocol.yaml

Line 235 in e468c2c

supportsIncremental:

Describe the solution you’d like

We can refactor these into a single map of supported features where the key would be the feature name it supports and the value would be the boolean.

It would make it easier to add feature flags without having to modify the protocol?

Describe the alternative you’ve considered or used

Individual supportsXXX flags

Additional context

#4031 (review)

[cgardens]

Agreed. I like this idea.

[cgardens]

closed as no longer relevant. we now add information like this to the actor definition.