[INTERNAL] ESLint: Re-format eslintrc
[INTERNAL] ESLint: Re-format eslintrc

- Use error/warn instead of numbers
- Group rules by categories
- Sort rules alphabetically

Change-Id: I51107fab636c70c1986cf2c5e5b65d52b242515c

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5