feature(zjow): add PPO demo for complex env observation

[zjowowen]

#615

[codecov]

Codecov Report

Merging #644 (89d9677) into main (4c182f6) will increase coverage by 0.03%.
The diff coverage is 38.88%.

❗ Current head 89d9677 differs from pull request most recent head 3e2b694. Consider uploading reports for the commit 3e2b694 to get more accurate results

@@            Coverage Diff             @@
##             main     #644      +/-   ##
==========================================
+ Coverage   82.66%   82.69%   +0.03%     
==========================================
  Files         581      581              
  Lines       47475    47579     +104     
==========================================
+ Hits        39243    39345     +102     
- Misses       8232     8234       +2     

Flag	Coverage Δ
unittests	82.69% <38.88%> (+0.03%)	⬆️

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

Impacted Files	Coverage Δ
ding/torch_utils/tests/test_data_helper.py	77.40% <ø> (-0.94%)	⬇️
ding/utils/default_helper.py	93.52% <33.33%> (-4.31%)	⬇️
ding/utils/tests/test_default_helper.py	95.69% <36.36%> (-3.73%)	⬇️
ding/framework/middleware/functional/trainer.py	79.48% <40.00%> (-6.23%)	⬇️
ding/framework/middleware/functional/collector.py	97.01% <100.00%> (ø)
ding/torch_utils/data_helper.py	78.51% <100.00%> (-0.44%)	⬇️

... and 68 files with indirect coverage changes

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