Add alternative snapshots for decimal values

[Dehalion]

I have a lot of data objects with decimal values. These are serialized in the snapshots using the default behavior of C#, which keeps all decimal places even if not necessary.

This results in failed snapshots because 10.0 is not the same as 10.000, which is just due to a change in calculations. The result should be the same though for my use case because it's the same value for further calculations.

I haven't found any settings to deal with this problem, neither in Snapper nor in Netwonsoft.Json

It would be nice though to have a way to tell Snapper that it should treat these decimal values the same so my snapshot tests are not breaking just because the value 10 can be represented with more than one decimal value.