Add v1 routes with authentication

[parberge]

Adds authentication by requiring a header (Authorization) with an expected value.

Old routes will be removed when all clients have been updated to use v1 routes.

Fixes #16

[parberge]

Authenticated request:

https https://ywdi37qne9.execute-api.eu-north-1.amazonaws.com/api/v1/foo 'Authorization: development'
HTTP/1.1 200 OK
Connection: keep-alive
Content-Length: 13
Content-Type: application/json
Date: Tue, 13 Apr 2021 17:10:28 GMT
Via: 1.1 ed87681648230d81cfe4a69364ab730c.cloudfront.net (CloudFront)
X-Amz-Cf-Id: TcevCFvizswEgfhuLckGDCuOm1MoLQwHrSI7H1i_S6pQVAx3bXXzoQ==
X-Amz-Cf-Pop: ARN54-C1
X-Amzn-Trace-Id: Root=1-6075d084-2d94af0e213bb4bd26536fc0;Sampled=0
X-Cache: Miss from cloudfront
x-amz-apigw-id: du2EpFcegi0FshA=
x-amzn-RequestId: 5eca8249-6f54-4096-b996-7fb807904de6

{
    "foo": "bar"
}

Unauthorized request:

https https://ywdi37qne9.execute-api.eu-north-1.amazonaws.com/api/v1/foo 'Authorization: wrong_key'
HTTP/1.1 403 Forbidden
Connection: keep-alive
Content-Length: 60
Content-Type: application/json
Date: Tue, 13 Apr 2021 17:10:42 GMT
Via: 1.1 f6020f10d519a41b0c116dad7dcb2798.cloudfront.net (CloudFront)
X-Amz-Cf-Id: 3RmUPMik5aBeH-lrnXerNKinfPcV4XWBK2iRsp24q57Y29bm3dxNCw==
X-Amz-Cf-Pop: ARN54-C1
X-Cache: Error from cloudfront
x-amz-apigw-id: du2G8FjJgi0F8FQ=
x-amzn-ErrorType: AccessDeniedException
x-amzn-RequestId: 5e9c1403-0550-4ba8-95c0-671de65d5278

{
    "Message": "User is not authorized to access this resource"
}

[kamigerami]

looks damn good!