[Feature] Generate ann_file for flyingthing3d_subset

[MeowZheng]

Motivation

It is for generating samples filename of flyingthings3d_subset dataset

Modification

Add tools/prepare_datasets/prepare_flyingthings3d_subset.py

[codecov[bot]]

Codecov Report

Merging #124 (c18f2fc) into master (579b68b) will increase coverage by 0.21%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #124      +/-   ##
==========================================
+ Coverage   68.78%   68.99%   +0.21%     
==========================================
  Files          92       92              
  Lines        5135     5135              
  Branches      727      727              
==========================================
+ Hits         3532     3543      +11     
+ Misses       1489     1478      -11     
  Partials      114      114              

Flag	Coverage Δ
unittests	68.99% <ø> (+0.21%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmflow/datasets/pipelines/transforms.py	79.33% <0.00%> (+1.83%)	:arrow_up:

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