Add a switch to allow the OTel SDK integration to be completely disabled

[sdaubin]

Overview

This allows the agent's Opentelemetry SDK autoconfiguration feature to be disabled with this setting:

opentelemetry.sdk.autoconfigure.enabled=false

For instance, start a process with this added: -Dnewrelic.config.opentelemetry.sdk.autoconfigure.enabled=false

This feature can currently be disabled by disabling the instrumentation, but this is a nicer looking switch.

Testing

The agent includes a suite of tests which should be used to
verify your changes don't break existing functionality. These tests will run with
Github Actions when a pull request is made. More details on running the tests locally can be found
here,

Checks

• Your contributions are backwards compatible with relevant frameworks and APIs.
• Your code does not contain any breaking changes. Otherwise please describe.
• Your code does not introduce any new dependencies. Otherwise please describe.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.87%. Comparing base (dd32a0f) to head (2a1a397).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1821      +/-   ##
============================================
- Coverage     70.88%   70.87%   -0.01%     
+ Complexity     9974     9971       -3     
============================================
  Files           829      829              
  Lines         39984    39984              
  Branches       6058     6058              
============================================
- Hits          28342    28338       -4     
- Misses         8915     8919       +4     
  Partials       2727     2727              

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