fix(multiple): support macOS Hover Text a11y feature

[Splaktar]

• remove cdk-visually-hidden class from native inputs, size/position them correctly for hovering, and hide them with opacity
• this approach is based on what MDC Web uses and how our mdc-radio and mdc-checkbox components are designed
• fix minor typos

Fixes #22950

Questions for reviewers

• Where should I put these common styles that in this case could potentially be shared across radio and checkbox?
• Should we update the cdk-visually-hidden style to use this approach instead? Likely too risky.

[Splaktar]

Need to test against

• [x] VoiceOver Chrome
• [ ] VoiceOver Safari
• [ ] JAWS Chrome
• [ ] JAWS Firefox
• [ ] NVDA Chrome
• [ ] NVDA Firefox

[mmalerba]

Closing since this fix is for the legacy components which have been superseded by the MDC based ones.

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