[Configs] Totaltext cfgs for DB and FCE

[gaotongxiao]

Based on #1632.
Add example totaltext configs for DBNet and FCENet.

[codecov]

Codecov Report

Base: 85.32% // Head: 85.31% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (3273ca0) compared to base (24bfb18).
Patch has no changes to coverable lines.

❗ Current head 3273ca0 differs from pull request most recent head 119d2eb. Consider uploading reports for the commit 119d2eb to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #1633      +/-   ##
===========================================
- Coverage    85.32%   85.31%   -0.01%     
===========================================
  Files          167      167              
  Lines        10275    10275              
  Branches      1422     1422              
===========================================
- Hits          8767     8766       -1     
  Misses        1259     1259              
- Partials       249      250       +1     

Flag	Coverage Δ
unittests	85.31% <ø> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
.../models/textdet/postprocessors/db_postprocessor.py	89.04% <0.00%> (-4.11%)	⬇️
mmocr/utils/polygon_utils.py	98.70% <0.00%> (+1.29%)	⬆️

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