[Fix] eval hook resume best acc

[linyq17]

Modification

1. Resume the best accuracy from the checkpoint in eval hook. --resume-from ignores last best accuracy #30
2. Make eval hook run before checkpoint saver hook by changing the priority to 45.

[codecov]

Codecov Report

Merging #33 (132250a) into main (f524344) will increase coverage by 0.04%.
The diff coverage is 100.00%.

❗ Current head 132250a differs from pull request most recent head 624bce6. Consider uploading reports for the commit 624bce6 to get more accurate results

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
+ Coverage   60.40%   60.44%   +0.04%     
==========================================
  Files         116      116              
  Lines        7397     7400       +3     
  Branches     1458     1459       +1     
==========================================
+ Hits         4468     4473       +5     
  Misses       2610     2610              
+ Partials      319      317       -2     

Flag	Coverage Δ
unittests	60.40% <100.00%> (+0.04%)	⬆️

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

Impacted Files	Coverage Δ
mmfewshot/classification/apis/train.py	18.33% <ø> (ø)
...wshot/classification/core/evaluation/eval_hooks.py	77.90% <100.00%> (+3.20%)	⬆️

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[jshilong]

LGTM