Allow single dependsOn as well as array

[johndowns]

While Bicep reduces the need to include an explicit dependsOn, I have found I need to do this occasionally. However, I typically only need to depend on one other resource.

I'd really like it if Bicep allowed me to specify a single dependency, and not just an array. For example, both of these would be valid:

resource x 'y.z@abc' = {
  name: 'x'
  dependsOn: y
}

resource x 'y.z@abc' = {
  name: 'x'
  dependsOn: [
    y
  ]
}

This would help with template readability, reduce visual noise, and reduce the overall line count of my Bicep files.