[trace][refactor] Move tracing related functions to a better place

[zhengfeiwang]

Description

Move tracing related functions

• promptflow._sdk._tracing: tracing related function import place, with unit tests covered and guarded
  • for promptflow-tracing: start_trace_with_devkit, setup_exporter_to_pfs
  • for OTLP collector, runtime and others: process_otlp_trace_request - parse span from Protocol Buffer
• promptflow._sdk._utils.tracing: utilities for tracing

Remove previous tracing utilities file _tracing_utils.py.

Pass function that gets credential

For process_otlp_trace_request usage, user should pass the function that how to get credential, instead of the credential itself. However, as the environment may not have Azure extension, so we cannot directly pass AzureCliCredential in outside; so add a default logic inside the function.

All Promptflow Contribution checklist:

• The pull request does not introduce [breaking changes].
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.
• Create an issue and link to the pull request to get dedicated review from promptflow team. Learn more: suggested workflow.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[github-actions]

promptflow SDK CLI Azure E2E Test Result zhengfei/refactor/tracing-utils

  4 files    4 suites   5m 2s ⏱️
238 tests 203 ✅  35 💤 0 ❌
952 runs  812 ✅ 140 💤 0 ❌

Results for commit dae9424.

♻️ This comment has been updated with latest results.

[github-actions]

SDK CLI Global Config Test Result zhengfei/refactor/tracing-utils

4 tests   4 ✅  1m 16s ⏱️
1 suites  0 💤
1 files    0 ❌

Results for commit dae9424.

♻️ This comment has been updated with latest results.

[github-actions]

Executor Unit Test Result zhengfei/refactor/tracing-utils

792 tests   792 ✅  3m 43s ⏱️
  1 suites    0 💤
  1 files      0 ❌

Results for commit dae9424.

♻️ This comment has been updated with latest results.

[github-actions]

Executor E2E Test Result zhengfei/refactor/tracing-utils

241 tests   236 ✅  5m 11s ⏱️
  1 suites    5 💤
  1 files      0 ❌

Results for commit dae9424.

♻️ This comment has been updated with latest results.

[github-actions]

SDK CLI Test Result zhengfei/refactor/tracing-utils

    4 files      4 suites   57m 41s ⏱️
  663 tests   650 ✅ 13 💤 0 ❌
2 652 runs  2 600 ✅ 52 💤 0 ❌

Results for commit dae9424.

♻️ This comment has been updated with latest results.