feat: Enhancement of CoAP server device service with CoAP client functionality

[sudhamani-hcl]

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PR Checklist

Please check if your PR fulfills the following requirements:

• [x] I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• [x] 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 not added any unit test cases, I have done functional testing.
• [x] 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?)

  It is a new feature update

  Testing Instructions

  Test setup is mentioned in README file. Total 6 test cases are tested.

  1. Auto events for int resource
  2. Auto events for float resource
  3. Auto events for json resource
  4. Put request to int resource
  5. Put request to float resource
  6. Put request to json resource

Test case inputs used for functionality testing are mentioned in below table

Test case No | datatype | PSK set in devices.json | Get/Set data at End device | Put data from EdgeX -- | -- | -- | -- | -- 1 | Int | No PSK | 9876 | {"int":"1234"} 2 | Int | hello123 | 9876 | {"int":"1234"} |   |   3 | Float | No PSK | 1.2345 | {"float":"9.8765"} 4 | Float | hello456 | 1.2345 | {"float":"9.8765"} |   |   5 | Json | No PSK | {JsonKey:JsonValue} | {"json":"{JsonKey:JsonValue}"} 6 | Json | hello789 | {JsonKey:JsonValue} | {"json":"{JsonKey:JsonValue}"} |   |  

All the above 6 test cases are passed.

New Dependency Instructions (If applicable)