errors: add error for wild card scope validation

[sajayantony]

No description provided.

[codecov-commenter]

Codecov Report

Merging #340 (ae9ac7b) into main (3981f69) will increase coverage by 0.07%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main     #340      +/-   ##
==========================================
+ Coverage   74.80%   74.88%   +0.07%     
==========================================
  Files          23       23              
  Lines        2203     2210       +7     
==========================================
+ Hits         1648     1655       +7     
  Misses        437      437              
  Partials      118      118              

Impacted Files	Coverage Δ
verifier/trustpolicy/trustpolicy.go	91.69% <100.00%> (+0.21%)	⬆️

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[ghost]

LGTM

[JeyJeyGao]

LGTM

[sajayantony]

❯ cat trustpolicy.json --plain
{
    "version": "1.0",
    "trustPolicies": [
        {
            "name": "notation-demos-images",
            "registryScopes": [ "localhost:5000/hello/*" ],
            "signatureVerification": {
                "level" : "strict"
            },
            "trustStores": [ "ca:notation-demos.io" ],
            "trustedIdentities": [
                "*"
            ]
        }
    ]
}

❯ ./bin/notation policy import ./trustpolicy.json
Existing trust policy configuration found, do you want to overwrite it? [y/N] y
Error: failed to validate trust policy: registry scope "localhost:5000/hello/*" with wild card(s) is not valid, make sure it is a fully qualified repository without the scheme, protocol or tag. For example domain.com/my/repository or a local scope like local/myOCILayout

[priteshbandi]

LGTM