Add more in-depth tests for debuggers #15
Description
Right now the source map spec tests mostly test conformance with the source map format, along with some basic mapping semantics properties.
It'd be nice to also test more in-depth debugging properties, such as the effect of ignoreList on debugger stepping, or the effects of scopes from the scope proposal on stepping.
I think it'd make sense to put these in a separate JSON file, as some tools (e.g., the validator) won't support these test cases.