CloudEvent validation fails due to strict encoding

[jskeet]

With a few workarounds, I've managed to get the .NET CloudEvent function to nearly meet validation - but the validation framework expects the mediaLink to be exactly:

"https://www.googleapis.com/download/storage/v1/b/some-bucket/o/Test.cs?generation=1587627537231057\u0026alt=media"

... whereas my output is:

"https://www.googleapis.com/download/storage/v1/b/some-bucket/o/Test.cs?generation=1587627537231057&alt=media"

Given that they're equivalent JSON, I believe it would be okay for the test to pass here. Perhaps validation tests that expect JSON should "parse and reformat" both input and output before comparing?

[roffjulie]

Jon, can you see if #17 resolves this? If not, we can add some additional validation on the medialink side.