Add `textStyle` in `showOkAlertDialog` and `showOkCancelAlertDialog`

[838]

[istornz]

This is a good feature to enable bold for example, please merge :)

[Natsagun]

This commit could open up more design possibilities, please merge ;)

[mono0926]

Sorry, but I'm closing this. Please see this: https://github.com/mono0926/adaptive_dialog?tab=readme-ov-file#how-can-i-customize-it-flexibly

If you need it, use the fork version.

Another idea, assuming we do something similar in the future, is the possibility of changing the type of those fields from String to Text as a disruptive change in a major update.