dev(lwq): add continuous examples: ddpg, td3 and d4pg

[Hcnaeg]

Description

Related Issue

TODO

Check List

• merge the latest version source branch/repo, and resolve all the conflicts
• pass style check
• pass all the tests

[codecov]

Codecov Report

Merging #384 (dd6e52b) into main (e00c5bf) will decrease coverage by 0.20%.
The diff coverage is n/a.

❗ Current head dd6e52b differs from pull request most recent head 6a2b8da. Consider uploading reports for the commit 6a2b8da to get more accurate results

@@            Coverage Diff             @@
##             main     #384      +/-   ##
==========================================
- Coverage   86.19%   85.98%   -0.21%     
==========================================
  Files         522      522              
  Lines       41113    40843     -270     
==========================================
- Hits        35437    35120     -317     
- Misses       5676     5723      +47     

Flag	Coverage Δ
unittests	85.98% <ø> (-0.21%)	⬇️

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

Impacted Files	Coverage Δ
ding/framework/message_queue/tests/test_nng.py	40.00% <0.00%> (-60.00%)	⬇️
ding/reward_model/tests/test_gail_irl_model.py	94.52% <0.00%> (-5.48%)	⬇️
ding/entry/tests/test_parallel_entry.py	45.45% <0.00%> (-4.55%)	⬇️
ding/envs/env_manager/envpool_env_manager.py	36.58% <0.00%> (-4.52%)	⬇️
ding/utils/render_helper.py	25.00% <0.00%> (-4.42%)	⬇️
ding/world_model/model/tests/test_ensemble.py	71.42% <0.00%> (-2.49%)	⬇️
ding/entry/tests/test_serial_entry_mbrl.py	76.47% <0.00%> (-2.48%)	⬇️
ding/utils/tests/test_k8s_launcher.py	88.46% <0.00%> (-2.11%)	⬇️
ding/utils/data/dataloader.py	45.07% <0.00%> (-2.08%)	⬇️
ding/entry/tests/test_serial_entry_onpolicy.py	80.39% <0.00%> (-1.84%)	⬇️
... and 197 more

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