feat(modal): clicking handle advances to the next breakpoint

[sean-perkins]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
  • Some docs updates need to be made in the ionic-docs repo, in a separate PR. See the contributing guide for details.
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Clicking the sheet modal handles not advance to the next available breakpoint.

Issue URL: #24069

What is the new behavior?

• Introduces handleBehavior, which controls if clicking the sheet modal handle advances to the next available breakpoint.
• handleBehavior defaults to none, meaning that existing sheet modals will need to opt-in to this behavior.
• Clicking the handle multiple times will ignore additional presses until the modal moves to the next breakpoint
• While a breakpoint is transitioning, clicking the backdrop will not dismiss the modal.
• When handleBehavior is cycle, the handle element will be focusable and include aria-labels informing "Activate to adjust the size of the dialog overlaying the screen".

Does this introduce a breaking change?

• Yes
• No

Other information

[liamdebeasi]

Great job! Just a few small things below.