feat: Add CORS support

[lenny-goodell]

Added CORS support enabled in go-mod-bootstrap

closes #982

Signed-off-by: Leonard Goodell leonard.goodell@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?) Not unit testable
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)
• I have opened a PR for the related docs change (if not, why?)
  Will be handled by @cloudxxx8 via this issue Create document to instruct the CORS settings edgex-docs#608

Testing Instructions

1. Clone the branch for this PR
2. Clone the branch for ASC PR (feat: Add CORS capability app-service-configurable#342)
3. Build ASC
4. Run ASC - ./app-service-configurable -p functional-tests -s
5. Send GET request to localhost:59705/api/v2/ping
6. Verify CORS headers not in response
7. Stop ASC
8. Modify ./res/functional-tests/configuration.toml to enable CORS

  [Service.CORSConfiguration]
  EnableCORS = true

9. rerun ASC - ./app-service-configurable -p functional-tests -s
10. Send GET request to localhost:59705/api/v2/ping
11. Verify CORS headers are now in the response

New Dependency Instructions (If applicable)

N/A

[jim-wang-intel]

LGTM