[Enhance] Group-Free-3D Benchmark on ScanNet

[hjin2902]

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Motivation

Release 4 groupfree3d models on ScanNet dataset.

Modification

Publish 4 models on ScanNet dataset and provide README.md.

BC-breaking (Optional)

Does the modification introduce changes that break the back-compatibility of the downstream repos?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.
No.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[codecov]

Codecov Report

Merging #710 (0899eb1) into master (1f79fc7) will not change coverage.
The diff coverage is n/a.

❗ Current head 0899eb1 differs from pull request most recent head b6ae53e. Consider uploading reports for the commit b6ae53e to get more accurate results

@@           Coverage Diff           @@
##           master     #710   +/-   ##
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  Coverage   48.93%   48.93%           
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  Files         208      208           
  Lines       15861    15861           
  Branches     2543     2543           
=======================================
  Hits         7761     7761           
  Misses       7606     7606           
  Partials      494      494           

Flag	Coverage Δ
unittests	48.93% <ø> (ø)

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