* feat: add opentelemetry-instrumentation-threading library
* fix: update python file with black formatter
* fix: modified title underline too short issue
* fix: modified library sorted via isort tool
* fix: modified CHANGELOG.md and remove unused parameter
* test: migrated unit test cases from the #1582 to this project
* chroe: updated the tox.ini test commands
* fix: fixed the lint issue
* feat: support ThreadPool and update document
* fix: fixed the lint issue
* refactor: remove redundant class and simplify capture OTel context usage
* fix: removed unused parameter
* test: added a new test case for thread pool
* fix: remove unused return response
* refactor: compared the array
* fix: remove f-string
* fix: fixed pylint issue
* fix: test library
* fix: updated CHANGELOG.md
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Co-authored-by: Aaron Abbott <aaronabbott@google.com>
