Support macOS Sonoma and Xcode.app

Breaking change

• We've loosened the requirement to have Xcode CLI installed. The package will
  now accept if you have the Xcode.app IDE installed.
  • Note: The Xcode.app IDE requires significantly more space compared to
    Xcode CLI. We highly suggest that you install Xcode CLI.

Features

• Added is_xcode_app_installed() to check to see if the full Xcode.app IDE
  is present.
• Added xcodebuild() to understand properties about the Xcode.app IDE
  installation.

Changes

• Updated the supported version of macOS to macOS Sonoma (14.0.0).
• Improved the error message when the version of macOS is not supported.
• xcode_cli_install() and macos_rtools_install() have been modified to
  skip the installation of Xcode CLI if the full Xcode.app IDE is detected.

Documentation

• Switched describing the ARM Mac entries from M1 or M2 to M-series to
  generalize with how Apple names software.
• Improved details regarding the paths being chosen for software installed.

Deployment

• Updated the GitHub Actions for both R-CMD-check and pkgdown.