Support JSON5 Modules

[summercms]

JSON Modules have been added, see here:

#4315
#4407

Would it be possible to also add JSON5 support, e.g.

import example from './config.json5';

The JSON5 Data Interchange Format (JSON5) is a superset of JSON that aims to alleviate some of the limitations of JSON by expanding its syntax to include some productions from ECMAScript 5.1.

Thanks.

Links: https://json5.org/

[Yay295]

tc39/proposal-json-modules#14

[annevk]

This would probably have to go through TC39 or at the very least incubated through WICG.