Update python loader.

* panda urdf with collisions

* adding the hand to the urdf

* loader with capsule transformation

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* fingers as capsules

* hand as capsule

* panda urdf with collisions

* adding the hand to the urdf

* loader with capsule transformation

* fingers as capsules

* hand as capsule

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* changing the heritage of pandaloadercollision

* Update python/example_robot_data/robots_loader.py

Co-authored-by: Guilhem Saurel <guilhem.saurel@laas.fr>

* fixing srdf path name

* Update python/example_robot_data/robots_loader.py

Co-authored-by: Guilhem Saurel <guilhem.saurel@laas.fr>

* getting rid of redundancy with the super

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* moving the static method generate_capsule_name to robot loader main class

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* adding unittest for panda collision

* fixing name of unittest

* deleting extra _ between the name of the link & capsule

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* Address comment in #242

* More sensible entry order

* Fix type error

* tests: reorder

* Update python/example_robot_data/robots_loader.py

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Guilhem Saurel <guilhem.saurel@laas.fr>
Co-authored-by: Fabian Damken <fabian.damken@stud.tu-darmstadt.de>

* alex description added

* modified meshes - size reduced - readme and license added

* Add go2 description

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- always try to import EXAMPLE_ROBOT_DATA_MODEL_DIR and EXAMPLE_ROBOT_DATA_SOURCE_DIR

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Removed since EigenPy 3

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Adds BSD-3 licensed ANYmal C simple description from
https://github.com/ANYbotics/anymal_c_simple_description commit
f119c8f3c4b9e08948b0f5915e9c7cedf63f52e5

Modified to:
1. Fix the path for mesh loading
2. Add SRDF

* cassie/cassie_v2 sdf: remove first primatic joint, add color information

* robots_loader: use updated sdf parser for pin version > 2.9.1

* cassie srdf: update joint info, add missing joints

Co-authored-by: Rohan Budhiraja <proyan@users.noreply.github.com>