Improved the visual appeal of SelectionPrompt and MultiSelectionPrompt (text wrapping)

[yymqn]

fixes #1577

• I have read the Contribution Guidelines
• I have commented on the issue above and discussed the intended changes
• A maintainer has signed off on the changes and the issue was assigned to me
• All newly added code is adequately covered by tests
• All existing tests are still running without errors
• The documentation was modified to reflect the changes OR no documentation changes are required.

Changes

I've modified how SelectionPrompt<T> and MultiSelectionPrompt<T> render the prompt. Instead of using Grid with only one column, I split the row into two columns, where one is the indentation, arrow, or checkbox and the second column is the text itself. This makes the wrapping look better.

Before the change:

After the change:

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Please upvote 👍 this pull request if you are interested in it.

[yymqn]

I've fixed an issue with SelectionPrompt<T> where the indentation was incorrect when using groups and nesting. Also, I've updated the code formatting to pass the analyzers.