Add config option to deprecate framework flavors

Created by: robbertvanginkel

Removing the frameworks flavor was previously attempted in #1911 but had to be reverted because removing the info_plist and info_plist_substitutions parameters on apple library were specified but not (always) used.

To attempt removing the code again, inform people who rely on the parameter/flavors by:

• Add a warning to indicate the frameworks flavor on apple_library will be removed in the future.
• Adding a config option that throws when the framework flavor that relies on the info_plist parameters is used.