[core] Improve Renovate groups

[eps1lon]

• list all packages from https://github.com/cssinjs/jss/tree/master/packages
• Add MUI-X group matching @mui/x-*

[mui-pr-bot]

Details of bundle changes

@material-ui/core: parsed: +Infinity% , gzip: +Infinity%
@material-ui/lab: parsed: +Infinity% , gzip: +Infinity%
@material-ui/styles: parsed: +Infinity% , gzip: +Infinity%
@material-ui/private-theming: parsed: +Infinity% , gzip: +Infinity%
@material-ui/system: parsed: +Infinity% , gzip: +Infinity%
@material-ui/unstyled: parsed: +Infinity% , gzip: +Infinity%
@material-ui/utils: parsed: +Infinity% , gzip: +Infinity%

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