Add Feature Discovery Support

[TelegramSam]

Add support for feature discovery to the StaticAgentConnection. This should report on any protocols that have registered handlers, including itself. RFC for feature discovery protocol: https://github.com/hyperledger/aries-rfcs/blob/master/features/0031-discover-features/README.md

The Indy Python Reference Agent can be used for testing: https://github.com/hyperledger/indy-agent/tree/master/python

Please reach out to @dbluhm and @TelegramSam with any questions.

[freemanjackal]

@dbluhm and @TelegramSam, Is it still help wanted? I am reading this: https://github.com/hyperledger/aries-rfcs/blob/master/features/0031-discover-features/README.md and this: https://github.com/hyperledger/aries-protocol-test-suite/blob/master/protocol_tests/discover_features/test_discover_features.py I could give a try...

[dbluhm]

Happy to accept a PR on this if you're interested :slightly_smiling_face:

Feel free to reach out on chat.hyperledger.org (@dbluhm there as well) or on this issue if you have any questions

[dbluhm]

As an update to the original comment, Aries Cloud Agent - Python (https://github.com/hyperledger/aries-cloudagent-python) is probably a better candidate for testing against than the now deprecated Indy Python Reference Agent. The test suite is also a good choice.