Generate and set a CFBundleIdentifier when none were provided on macOS

When using Ninja generator on macOS, we now do a bit of extra work to
make sure that bundle identifier is always set.

- In the case where no identifier was provided, the warning message has
  been updated indicating that the user can set either of the
  properties.
- If both `MACOSX_BUNDLE_GUI_IDENTIFIER` and
  `XCODE_ATTRIBUTE_PRODUCT_BUNDLE_IDENTIFIER` were set but have
  different values, a warning will be shown to encourage the user to set
  only one of them.
- In addition `_qt_internal_get_ios_bundle_identifier_prefix` is renamed
  to `_qt_internal_get_apple_bundle_identifier_prefix` to be more
  platform specific.

Note:
    In general, if Ninja is the generator, we set the value of
    `MACOSX_BUNDLE_GUI_IDENTIFIER` and don't touch the
    `XCODE_ATTRIBUTE_PRODUCT_BUNDLE_IDENTIFIER`. If Xcode is the
    generator, we set the value of
    `XCODE_ATTRIBUTE_PRODUCT_BUNDLE_IDENTIFIER`, and in addition, to
    silence a Xcode warning, we set the `MACOSX_BUNDLE_GUI_IDENTIFIER`
    to `${PRODUCT_BUNDLE_IDENTIFIER}`, ie., let Xcode figures it out if
    needed.

[ChangeLog][CMake][macOS] When using Ninja generator, if neither
`XCODE_ATTRIBUTE_PRODUCT_BUNDLE_IDENTIFIER` nor
`MACOSX_BUNDLE_GUI_IDENTIFIER` is provided for a target, a bundle
identifier, i.e., `com.yourcompany.<teamid>.<target>` will be generated
and set as CFBundleIdentifier.

Pick-to: 6.5
Fixes: QTBUG-110889
Change-Id: Ie071085bbaf465afcb022b760423eb6b3c921f6d
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

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