dart2js implementation for super-initializer parameters

[devoncarew]

See #48055 for the main tracking issue.

cc @sigmundch

[sigmundch]

This is likely going to be entirely handled by the CFE lowering, but we'll keep this open until we validate that such is the case.

[sigmundch]

@rakudrama - I'm closing this assuming there is nothing more to do, but please reopen if I missed something.