fix(autocomplete): improve handling of touch pads and touchscreens

[Splaktar]

PR Checklist

Please check that your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added or this is not a bug fix / enhancement
• Docs have been added, updated, or were not required

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Enhancement
[ ] Documentation content changes
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

• md-autocomplete closes instantly or does not open when opened on touchscreens and touch pads.
• The options panel fix for closing the pop-up on backdrop tap in PR fix(autocomplete): tap outside options panel on iOS does not close panel #11625 isn't consistently effective.

Issue Number:
Fixes #11778. Relates to #11625. Relates to #11757. Relates to #11758.

What is the new behavior?

• open options pop-up on touchstart
  • since a click is often not sent on touch devices
  • this usually happens when the start/end point are not the same
• use touchend on the document to close the options panel on iOS
  • iOS mostly does not send click events for taps on the backdrop
  • call `doBlur()`` since iOS doesn't blur in this case
• combine some jQuery event handler calls
• combine duplicate onMouseup() and focusInputElement() functions
• don't let touchstart or touchend events bubble out of the component
• focus the input for mousedown events
  • this covers an edge case on touch pads where a click isn't sent
• move isIos and isAndroid logic out of gestures into $mdUtil
• add and correct JSDoc
• Disable click hijacking in docs as we recommend this to most users now.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

Tested on

• macOS: Chrome, Firefox, Safari w/ mouse and touch pad
• Chrome OS: w/ touchscreen and touch pad
• iOS: iPad touchscreen
• Android: Pixel 3 touchscreen