fix(material/list): add radio toggles

[zarend]

fix(material/list): add radio toggles

Add radio toggles for single selection. Fix a11y issue where selected state is visually communicated with color alone.

Rename checkboxPosition Input to togglePosition and deprecate checkboxPosition. togglePosition configures the position of both the radio and checkbox indicators. checkboxPosition also configures the position of both.

Summary of API and behavior changes:

• MDC List displays radio indicators for single-selection
• rename checkboxPosition Input to togglePosition
• rename type MatListOptionCheckboxPosition to type MatListOptionTogglePosition

DEPRECTED:

• checkboxPosition is deprecated because togglePosition replaces it
• MatListOptionCheckboxPosition is deprecated because MatListOptionTogglePosition replaces it

Closes https://github.com/angular/components/issues/7157, Fixes https://github.com/angular/components/issues/25900

[zarend]

Hi all, I've made fixes to respond to PR comments

• update the code comments: say checkbox/radio or toggle instead of just checkbox
• delete MatListOptionCheckboxPosition and @Input checkboxPosition, which are replaced by MatListOptionTogglePosition and @Input togglePosition
• add getRadioPosition method to test harness

@crisbeto does this PR look good to you?

[zarend]

I've made fixed based on PR comments and changed the target to minor:

• checkboxPosition is deprecated because togglePosition replaces it
• MatListOptionCheckboxPosition is deprecated because MatListOptionTogglePosition replaces it
• export MatListOptionCheckboxPosition using the export as syntax 👌

@crisbeto @mmalerba this is ready for your eyes again :eyes:

[zarend]

changes since this was last reviewed:

• fixed regression in radio dark mode because MDC's global variables were not configured correctly
• consolidated calls to using-mdc-theme

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