feat(datetime-button): update design to match iOS 17 spec

[brandyscarney]

Issue number: N/A

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What is the current behavior?

Datetime button combines Material Design and iOS styles.

What is the new behavior?

• Splits the styles into their own mode files for Material Design & iOS and updates the iOS styles to match iOS 17.
• Updates the basic test to include a screenshot test in both modes & directions.

I removed all of the datetime button screenshots before running the action to generate screenshots. Some screenshots were not added back but this is correct for the following reasons:

• datetime-button-disabled does not run for ios or rtl so those were removed
• datetime-overlay-modal and datetime-overlay-popover do not run for rtl so those were removed
• datetime-overlay-popover skips the test in firefox so that was removed

I can add these back if you want since they aren't part of this PR but they should have probably been removed when the test was updated to exclude directions/modes.

Does this introduce a breaking change?

• Yes
• No

Other information

I compared the datetime button against native iOS 17.1.2:

iOS 17	Ionic

Diff: