Add method name to the InlineSnapshot interface

[ext]

Related to my other discussion I was thinking the InlineSnapshot interface could (optionally?) contain the matcher name:

 export interface InlineSnapshot {
   snapshot: string
   testId: string
   file: string
   line: number
   column: number
+  method: string
 }

This could then be used instead of having the names toMatchInlineSnapshot and toThrowErrorMatchingInlineSnapshot hardcoded all over the place.

If this seems like a sane approach I'd gladly make a pull request implementing this change.