fix(compartment-mapper): avoid mislabeling cjs files as esm based on type field 1

[naugtur]

A version of the fix that doesn't introduce assumptions about language vs extension into the makeExtensionParser function, but at a cost of parsing extensions in graphPackage where it aggregates types.

An alternative: #1230

[kriskowal]

I like #1230 more but trust your judgement if stacking these changes helps.

[naugtur]

I'm looking at a choice between stacking this onto the other solution so that types field doesn't contain lies OR renaming types to indicate it's not the final verdict on the module type.

Renaming would be an obvious choice but the rename propagates across the codebase further than I'd want it to - which made me hesitate.
Not closing this for now