feat: Consume watch for common Writable config changes

[lenny-goodell]

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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?) N/A
• 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?)
  

Testing Instructions

Run EdgeX non-secure stack
Build app template from this branch and run from command line with -cp
Verify logs contain the following:

"listening for private config changes"
"listening for all services common config changes"
"listening for application service common config changes" 

In Consul add Writable/Telemetry/Interval to edgex/v3/core-common-config-bootstrapper/app-services with value of 20s
Verify the log contains:

"Writeable configuration has been updated from the Configuration Provider"
"Telemetry interval has been updated. Processing new value..."
"Metrics Manager report interval changed to 20s"

New Dependency Instructions (If applicable)

[jim-wang-intel]

LGTM