Add GEM-SMPL supplemental RICH and 3DPW support files

gem_smpl/missing_hmr4d_support/README_GEM_missing_files.txt

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+GEM missing hmr4d_support files
+
+This folder contains the missing RICH / 3DPW support files for GEM.
+
+Copy or merge the `inputs/` directory in this folder into the root of the
+GEM repository. After copying, the files should be located at:
+
+inputs/RICH/hmr4d_support/rich_test_vimo_preproc.pt
+inputs/3DPW/hmr4d_support/test_3dpw_vimo_labels.pt
+inputs/3DPW/hmr4d_support/3dpw_test_slam_traj.pt
+
+These paths are the ones used by:
+
+gem/datasets/rich/rich_motion_test.py
+gem/datasets/threedpw/threedpw_motion_test.py
+gem/datasets/threedpw/threedpw_occ_motion_test.py

gem_smpl/missing_hmr4d_support/inputs/3DPW/hmr4d_support/3dpw_test_slam_traj.pt

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+version https://git-lfs.github.com/spec/v1
+oid sha256:16340d0f2cf1453762163082f327d0a3cebd1488399dff71e60e1d001e53d249
+size 3271056

gem_smpl/missing_hmr4d_support/inputs/3DPW/hmr4d_support/test_3dpw_vimo_labels.pt

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+version https://git-lfs.github.com/spec/v1
+oid sha256:8fd8a8d1a5a10804257c4fac30c0215c32757aa995d5576b73380eda29f3fe35
+size 466754526

gem_smpl/missing_hmr4d_support/inputs/RICH/hmr4d_support/rich_test_vimo_preproc.pt

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+version https://git-lfs.github.com/spec/v1
+oid sha256:4506ad4b0663b7933e4679f367b23067a06671f35c0c59a0bf1a9418a894296d
+size 1653984970