Add Type.Equal(Type) bool function to compare Cadence types efficiently

[fxamacker]

Issue To Be Solved

Checking if cadence.Type are equal is currently done by comparing Type.ID(). It should be possible to provide a more efficient way to do this comparison in Go.

Suggested Solution

One solution is to add Type.Equal(Type) bool function to cadence.Type interface.

During brief chat about this on Slack, @turbolent confirmed we don't currently have a utility function to do this comparison and also mentioned it should be possible to do recursive comparison without allocating.