Add OpenTelemetry tracing support and examples

[patrickcping]

Change Description

Add OpenTelemetry tracing support to the SDK and examples.

• Introduced tracing utilities in config and pingone packages
• Added new example for OpenTelemetry instrumentation
• Updated main.go files in examples to demonstrate tracing
• Updated go.mod and go.sum for dependencies

BREAKING CHANGE: Client initiation now requires a context.Context to be passed. No breaking changes on resources themselves.

Change Characteristics

• This PR contains beta functionality
• This PR requires introduction of breaking changes
• No changelog entry is needed
• This PR contains code from the SDK generator process
• This PR contains written code

Checklist

• Check to confirm: I have performed a review of my PR against the PR checklist and confirm that:
  • Changes have proper test coverage (including regression tests)
  • Does not introduce breaking changes (unless required to do so)
  • I am aware that changes to generated code may not be merged

Required SDK Upgrades

N/a

Testing

This PR has been tested with:

• Unit tests (please paste commands and results below)
• Acceptance tests (please paste commands and results below)
• End-to-end tests (please paste the link to the actions workflow runs)
• Not applicable (no evidences needed)

Unit test results

$ make test
All tests passed.