support filtering on annotation with regex

[wangxiaoxuan273]

Signed-off-by: wangxiaoxuan273 [email protected]

Resolves issue #203

[wangxiaoxuan273]

As annotation has the structure of map[string]string, my implementation of the filtering has 2 arguments: key and regex. The function will first call the map with key, and then match the returned value with regex.

[codecov-commenter]

Codecov Report

Merging #259 (2a7fceb) into main (da314f8) will decrease coverage by 0.07%.
The diff coverage is 60.86%.

@@            Coverage Diff             @@
##             main     #259      +/-   ##
==========================================
- Coverage   70.57%   70.50%   -0.08%     
==========================================
  Files          35       35              
  Lines        3055     3078      +23     
==========================================
+ Hits         2156     2170      +14     
- Misses        669      675       +6     
- Partials      230      233       +3     

Impacted Files	Coverage Δ
extendedcopy.go	66.66% <60.86%> (-1.76%)	⬇️

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[shizhMSFT]

Instead of FilterAnnotation, I am thinking if FilterPredecessors might be more appropriate.

[shizhMSFT]

LGTM