[Feature Request] Add aria-labels to buttons on Date Picker for accessibility

[cmooreDT]

Problem to solve

1. Icon buttons within date picker have no text. When a screen reader focuses on them, it announces "button" and gives the user no indication as to what action would be performed by said button.
2. Dates are being read as numbers.
3. Current/today's date lacks aria-current attribute

Proposed solution

1. Add aria-labels to icon buttons -- select year, previous month, next month
2. Add aria-labels to date buttons so that they are read in full (day of the week, month day, year). For example, 13 would read as "Wednesday, November 13, 2024".
3. Current/today's date should have the attribute aria-current="date"