Python: Add tau2 benchmark integration with comprehensive testing and documentation (#817)

* first commit to tau2-bench

* tau2-bench agent

* tau2 agent

* add condition

* checkpoint

* bug fix

* add tests

* fix tests

* add comments

* add comments

* minor fix

* fix

* batch test script

* .

* init.bak -> init.py

* fix mypy

* update readme

* fix env

* remove temp files

* setup tests

* fix gaia tasks

* fix tau2 tests

* fix coverage

* fix default version

* update cookiecutter template

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Co-authored-by: Eric Zhu <ekzhu@users.noreply.github.com>

.github/workflows/python-merge-tests.yml

@@ -237,6 +237,8 @@ jobs:
           fail-on-empty: true
           title: Test results
 
+  # TODO: Add python-tests-lab
+
   python-integration-tests-check:
     if: always()
     runs-on: ubuntu-latest