Add grouping functionality for tables

[elizavetaRa]

Description

Grouping as well as preview functionality for the tables, web part
ODS part: owncloud/owncloud-design-system#1838
Replacement of #6165

Setup is done with the property "groupingSettings" . Following settings are possible:

• groupingFunctions: Object with keys as grouping options names and functions that get a table data row and return a group name for that row. The names of the functions are used as grouping options.

• groupingBy: must be either one of the keys in groupingFunctions or 'None'. If not set, default grouping will be 'None'.

• ShowGroupingOptions: boolean value for showing or hinding the select element with grouping options above the table.

• sortGroups: Object with keys as grouping options names and as values functions that get an array of groups and return a sorted array of groups.

Related Issue

Motivation and Context

UX-friendly option for better overviews of table contents

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• [ x] New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests

Checklist:

• [ x] Code changes
• Unit tests added
• Acceptance tests added
• Documentation added/updated

Open tasks:

• Tests

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[kulmann]

Superseded by #6680