COSE support updates

[shizhMSFT]

Tracking the merger of the cose branch into main.

[JeyJeyGao]

I will work on this PR.

[codecov-commenter]

Codecov Report

Merging #302 (75b256f) into main (8bec8a7) will decrease coverage by 0.08%. The diff coverage is 25.45%.

@@            Coverage Diff             @@
##             main     #302      +/-   ##
==========================================
- Coverage   30.62%   30.53%   -0.09%     
==========================================
  Files          25       26       +1     
  Lines        1610     1657      +47     
==========================================
+ Hits          493      506      +13     
- Misses       1104     1138      +34     
  Partials       13       13              

Impacted Files	Coverage Δ
cmd/notation/push.go	21.91% <0.00%> (-2.70%)	:arrow_down:
cmd/notation/verify.go	17.92% <0.00%> (-1.08%)	:arrow_down:
internal/cmd/flags.go	50.00% <0.00%> (-4.55%)	:arrow_down:
internal/cmd/options.go	0.00% <0.00%> (ø)
internal/cmd/signer.go	0.00% <0.00%> (ø)
internal/envelope/envelope.go	100.00% <100.00%> (ø)
pkg/configutil/once.go	100.00% <100.00%> (ø)

:mega: We’re building smart automated test selection to slash your CI/CD build times. Learn more

[dtzar]

I'm pretty sure this PR is superseed by #365. Can we close this one @shizhMSFT ?

[shizhMSFT]

Closing this tracker PR as it is succeeded by #365