[enhance]: Update tutorials for changing training settings

[ZwwWayne]

This PR adds tutorials for changing training settings, including optimization, learning rate scheduler.

[hellock]

Task linked: CU-49ta06 Creating hooks

[codecov]

Codecov Report

Merging #3778 into master will increase coverage by 0.49%.
The diff coverage is 75.94%.

@@            Coverage Diff             @@
##           master    #3778      +/-   ##
==========================================
+ Coverage   60.93%   61.42%   +0.49%     
==========================================
  Files         217      216       -1     
  Lines       15374    15514     +140     
  Branches     2628     2634       +6     
==========================================
+ Hits         9368     9530     +162     
+ Misses       5537     5507      -30     
- Partials      469      477       +8     

Flag	Coverage Δ
#unittests	61.42% <75.94%> (+0.49%)	⬆️

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

Impacted Files	Coverage Δ
mmdet/models/dense_heads/reppoints_head.py	22.34% <0.00%> (ø)
mmdet/models/dense_heads/rpn_test_mixin.py	83.87% <0.00%> (ø)
mmdet/models/detectors/reppoints_detector.py	100.00% <ø> (+75.00%)	⬆️
mmdet/models/detectors/single_stage.py	84.61% <0.00%> (-3.39%)	⬇️
mmdet/models/dense_heads/dense_test_mixins.py	15.00% <15.00%> (ø)
mmdet/models/dense_heads/gfl_head.py	27.39% <20.00%> (+0.08%)	⬆️
mmdet/models/dense_heads/atss_head.py	28.44% <40.00%> (+0.37%)	⬆️
mmdet/core/fp16/deprecated_fp16_utils.py	46.66% <46.66%> (ø)
mmdet/models/dense_heads/anchor_head.py	85.04% <58.33%> (-1.85%)	⬇️
mmdet/utils/collect_env.py	40.00% <66.66%> (+17.08%)	⬆️
... and 32 more

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[dreamerlin]

typo here registered

[dreamerlin]

PyTorch