Add coordinated dual-arm atomic actions

[skywhite1024]

Summary

• Add coordinated placement and coordinated pickment atomic actions for dual-arm workflows.
• Add typed targets/state, exports, API docs, demos, and GLB tutorial assets.
• Add a coordinated pickment documentation GIF with target/grasp axes and a fixed front-facing camera.
• Add focused tests for coordinated target/state/action behavior.

Validation

• git diff --check
• python3 -m py_compile scripts/tutorials/atomic_action/coordinated_pickment.py
• conda run -n embodichain040 python -m black --check --diff --color ./
• conda run -n embodichain040 python -m pytest tests/sim/atomic_actions/test_actions.py tests/sim/atomic_actions/test_core.py tests/sim/atomic_actions/test_engine.py (55 passed)

Notes

• The coordinated pickment GIF is stored at docs/source/_static/atomic_actions/coordinated_pickment.gif.
• PR branch is based on main.