Add support for Japanese vaccination passport app

[shuuji3]

Hello🙂

This PR proposes to add a new key for the Japanese vaccination passport app. This app was published officially on December 20 by the Japanese government agency (website: https://www.digital.go.jp/policies/posts/vaccinecert (in Japanese)). I think currently this repository has only the keys from the Canadian municipalities but I think this web app has the best UI among similar programs so I'd be happy to be able to use it to test and learn the Japanese vaccination data too.

I got the keys from this URL: https://vc.vrs.digital.go.jp/issuer/.well-known/jwks.json. Maybe you are not familiar with the Japanese government website but the domain digital.go.jp is under the control of the Digital Agency of the Japanese Government (Digital Agency - Wikipedia) so I believe you can also think of this as reliable keys.

Here is the first part of the decoded code of my card:

{
    "iss": "https://vc.vrs.digital.go.jp/issuer",
    "nbf": 1639970498.349618,
    "vc": {
        "type": [
            "https://smarthealth.cards#health-card",
            "https://smarthealth.cards#immunization",
            "https://smarthealth.cards#covid19"
        ],
        "credentialSubject": {
            "fhirVersion": "4.0.1",
            "fhirBundle": {
                "resourceType": "Bundle",
                "type": "collection",
                "entry": [
                    {
                        "fullUrl": "resource:0",
                        "resource": {
                            "resourceType": "Patient",
                            "name": [
                                {
                                    "use": "usual",
                                    "family": "\\u9ad8\\u6a4b",
                                    "given": [
                                        "\\u5b97\\u53f2"
                                    ]
                                },
                                {
                                    "use": "official",
                                    "family": "TAKAHASHI",
                                    "given": [
                                        "SHUUJI"
                                    ]
                                }
                            ],

Also, I tested it using my own vaccination certification QR code and it works without issues.

Before

After

Thanks!

[obrassard]

Hello @shuuji3 ! Thank you for your contribution, it looks good to me !

I will merge your PR 👍

[shuuji3]

Thank you! 😀

I confirmed that it works on production environment too.

[shuuji3]

@obrassard Sorry, I forgot to update README.md. Could you take a look at #29? Thanks.