Implement Google JWT verification and OpenID Google client id init parameter.

[sea-snake]

Implement Google JWT verification and OpenID Google client id init parameter.

Changes

• Implemented verify method in openid module.
• Implemented verify method in google module, called by the above.
• Implemented OpenID Google client id init parameter.

Tests

• Verify signature
• Verify validity window
• Verify issuer
• Verify audience
• Verify nonce

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[lmuntaner]

A few comments. Code looks good, I wonder about the usage of the env var.

[lmuntaner]

You need to add the new field to src/internet_identity/internet_identity.did manually.

For now, that's not created automatically, but we have a test to check compatibility.

Then, there should be an automatic action to add the delcaraions in JS and TS.