Aws Implementation Issue with Custom domain with path
I am trying to use same custom domain name for stage and production separated by path but Grant is failing in that case. example

```
https://custom.domain/stage --> Stage Lambda (Stage : $default)
https://custom.domain/prod --> Prod Lambda (Stage : $default)
```

Settings used for prod
```
{
    "defaults": {
      "origin": "https://custom.domain",
      "prefix": "/prod",
      "transport": "session",
      "state":true
    },
    "google": {
      "authorize_url": "https://accounts.google.com/o/oauth2/auth",
      "access_url": "https://accounts.google.com/o/oauth2/token",
      "oauth": 2,
      "scope_delimiter": " ",
      "pkce": true,
      "scope": [
        "profile",
        "email",
        "openid"
      ],
      "response": ["tokens", "profile"],
      "nonce": true,
      "custom_params": {
        "access_type": "offline",
        "prompt": "consent"
      },
      "callback": "https://another.domain"
    }
  }
```

Settings used for prod
```
{
    "defaults": {
      "origin": "https://custom.domain",
      "prefix": "/stage",
      "transport": "session",
      "state":true
    },
    "google": {
      "authorize_url": "https://accounts.google.com/o/oauth2/auth",
      "access_url": "https://accounts.google.com/o/oauth2/token",
      "oauth": 2,
      "scope_delimiter": " ",
      "pkce": true,
      "scope": [
        "profile",
        "email",
        "openid"
      ],
      "response": ["tokens", "profile"],
      "nonce": true,
      "custom_params": {
        "access_type": "offline",
        "prompt": "consent"
      },
      "callback": "https://another.domain"
    }
  }
```
Event version used : 1.0

What did I see?
```
path = '/prod/google'
requestContext.path = '/google'
```

I saw in grant library it always expects that to be `'/prod/google'` for `requestContext.path`. As of now I am overriding that value inside from my script as `event.requestContext.path = event.path;`.
Can you please suggest me for better solution?

Thanks.