Add deprecation warnings to generated LocalizedStringResource API

[liamnichols]

In 0.4.0, we introduced LocalizedStringResource.localized(_:) to match the same method added to LocalizedStringKey and as a result, we deprecated the original generated code on the LocalizedStringResource type.

In 0.4.0 however, a warning was not omitted. In 0.5.0, I am now omitting a warning because this code will be removed from an upcoming release:

Please see the following from the 0.4.0 release notes:

It is now preferred to use the LocalizedStringKey.localizable(_:) or LocalizedStringResource.localizable(_:) static methods instead of the LocalizedStringResource.localizable static property. The static property has been marked as deprecated. A warning will be emitted starting in 0.5.0 and the code will be completely removed in 1.0.0. See below for migrating your code:

- Text(.localizable.foo)
+ Text(.localizable(.foo))

- String(localized: .localizable.bar)
+ String(localizable: .bar)

- .navigationTitle("\(.localizable.title)")
+ .navigationTitle(.localizable(.title))