feat: Added `notation certificate` command for trust store

[patrickzheng200]

This PR is the implementation of notation certificate command regarding the use of trust store. Based on community meeting, this command only effects on User level.

Signed-off-by: Patrick Zheng [email protected]

[codecov-commenter]

Codecov Report

Merging #405 (4e0fc5c) into main (8d1d4dc) will decrease coverage by 0.89%. The diff coverage is 28.12%.

@@            Coverage Diff             @@
##             main     #405      +/-   ##
==========================================
- Coverage   33.84%   32.95%   -0.90%     
==========================================
  Files          21       25       +4     
  Lines        1105     1232     +127     
==========================================
+ Hits          374      406      +32     
- Misses        722      814      +92     
- Partials        9       12       +3     

Impacted Files	Coverage Δ
cmd/notation/cert/cmd.go	0.00% <0.00%> (ø)
cmd/notation/main.go	0.00% <0.00%> (ø)
cmd/notation/cert/list.go	13.79% <13.79%> (ø)
cmd/notation/cert/add.go	29.09% <29.09%> (ø)
cmd/notation/cert/show.go	30.76% <30.76%> (ø)
cmd/notation/cert/delete.go	33.33% <33.33%> (ø)
cmd/notation/cert/generateTest.go	17.92% <48.71%> (ø)
cmd/notation/list.go	23.94% <100.00%> (ø)

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