feature(react-tree): introduces navigationMode property

[bsunderhus]

Previous Behavior

New Behavior

1. Introduces navigationMode property
   • tree (default) - navigation as expected by tree WAI ARIA spec (+ actions interactions)
   • treegrid - navigation similar to treegrid WAI ARIA spec. pressing right arrow either opens the treeitem if it's a branch or goes from the treeitem (row) to its actions (cell). pressing up arrow goes to previous item, and down arrow to next item
2. adds a story to showcase the new navigation mode.

Problems related:

1. tabbing navigation between treeitem and actions is still valid (might be worth investigating tabster support to invalidate this navigation)

Related Issue(s)

• Fixes #

[github-actions]

📊 Bundle size report

Package & Exports	Baseline (minified/GZIP)	PR	Change
react-components react-components: entire library	1.164 MB 291.433 kB	1.165 MB 291.674 kB	1.136 kB 241 B
react-tree FlatTree	145.565 kB 41.884 kB	147.367 kB 42.323 kB	1.802 kB 439 B
react-tree PersonaFlatTree	146.251 kB 41.984 kB	148.055 kB 42.342 kB	1.804 kB 358 B
react-tree PersonaTree	142.475 kB 40.818 kB	144.278 kB 41.181 kB	1.803 kB 363 B
react-tree Tree	141.787 kB 40.712 kB	143.59 kB 41.153 kB	1.803 kB 441 B

Unchanged fixtures

Package & Exports	Size (minified/GZIP)
react-components react-components: Button, FluentProvider & webLightTheme	69.236 kB 20.182 kB
react-components react-components: Accordion, Button, FluentProvider, Image, Menu, Popover	222.641 kB 64.474 kB
react-components react-components: FluentProvider & webLightTheme	44.473 kB 14.597 kB
react-portal-compat PortalCompatProvider	8.39 kB 2.64 kB
react-timepicker-compat TimePicker	108.551 kB 36.094 kB

_{🤖 This report was generated against 556fc8e7b9a921cedbb07c2f0670dfabcf8ec0ed}

[github-actions]

Pull request demo site: URL

behaviour does't match spec