[FEAT] Accept time format as a param in `get_display_date`

[NeonDaniel]

Objective

Currently, time format is read from user profile settings. A more flexible implementation would allow the request object to specify the format directly

Initial Implementation Requirements

• Update request schema to include a format param (likely with a Literal annotation)
• Confirm backwards-compat. with requests that exclude format reading the user settings (if present)

Other Considerations

• 2.0.0 #87 (comment)
• This method is probably used by the homescreen skill, so maintaining backwards-compatibility is necessary