[Fix] Support format_result and fix prefix param in cityscape metric, and rename CitysMetric to CityscapesMetric

[MeowZheng]

as title

[codecov]

Codecov Report

Patch coverage: 85.71% and project coverage change: -0.11 ⚠️

Comparison is base (19f9285) 83.52% compared to head (fd22d79) 83.42%.

❗ Current head fd22d79 differs from pull request most recent head 7c628e6. Consider uploading reports for the commit 7c628e6 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2660      +/-   ##
===========================================
- Coverage    83.52%   83.42%   -0.11%     
===========================================
  Files          147      147              
  Lines         8621     8626       +5     
  Branches      1293     1295       +2     
===========================================
- Hits          7201     7196       -5     
- Misses        1195     1207      +12     
+ Partials       225      223       -2     

Flag	Coverage Δ
unittests	83.42% <85.71%> (-0.11%)	⬇️

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Impacted Files	Coverage Δ
mmseg/evaluation/metrics/citys_metric.py	86.66% <84.21%> (-3.34%)	⬇️
mmseg/evaluation/__init__.py	100.00% <100.00%> (ø)
mmseg/evaluation/metrics/__init__.py	100.00% <100.00%> (ø)
mmseg/datasets/transforms/transforms.py	89.49% <0.00%> (-0.91%)	⬇️

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