feat: add GetCapabilities and GetEndpointReference

[ajcasagrande]

• Adds general GetCapabilities
• Adds GetServiceCapabilities for each service
• Adds GetEndpointReference command

Signed-off-by: Anthony Casagrande anthony.j.casagrande@intel.com

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PR Checklist

Please check if your PR fulfills the following requirements:

• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?)
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)
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Testing Instructions

See updated postman collection for how to call the commands.

MAKE SURE YOU ARE USING THE LATEST DEVICE PROFILES PROVIDED HERE
The easiest way of ensuring this is to run a make clean and start fresh on the edgex-compose project.

New Dependency Instructions (If applicable)

[brianointel]

looks good to me!