Demo Gen Organized Output

[ambiguousname]

Fixes #609.

Looks much more human readable now, with output like:

export function formatWrite(name, grouping_strategy, some_other_config, v) {
    
    let locale = new Locale(name);
    
    let provider = DataProvider.newStatic();
    
    let options = FixedDecimalFormatterOptions.fromFields({
        groupingStrategy: grouping_strategy,
        someOtherConfig: some_other_config
    });
    
    let self = FixedDecimalFormatter.tryNew(locale,provider,options);
    
    let value = new FixedDecimal(v);
    
    let out = self.formatWrite(value);
    

    return out;
}

Quite a few TODOs with this one:

• Global variable name collision avoidance
  • Tests
• Recursive variable name (based on the variable it will be used for)
  • Tests
• Rename all self parameters to something based on the type name
• Calling a getter
  • Tests
• Remove all associated TODOs from terminus.rs (once these are checked off)
• Update docs/demo_gen.md

[ambiguousname]

Most of the other TODOs are pretty small fixes in comparison, but all the main changes are here

[ambiguousname]

Once this is merged, I'll also update the quickstart repo to use this new generation style