[Enhancement] Provide API to configure behaviors of different backends

[syeopite]

In Lens, each of the backends currently have a slightly different behavior.

For instance, the Gettext family of backends returns the given ID when a translation is not found.

backend = Gettext::MOBackend.new("locales")
catalogue_hash = backend.create()
catalogue = catalogue_hash["en_US"]
catalogue.gettext("I don't exist") # => "I don't exist" 

Whereas the RubyI18n YAML backend would raise an LensExceptions::MissingTranslation

catalogue = RubyI18n::Yaml.new("locales")
catalogue.translate("en", "I  also don't exist") # => LensExceptions::MissingTranslation

Not to mention the fact that Gettext requires creating a catalogue object first while the other doesn't.

This discrepancy is intentional, in order to preserve the behaviors seen in their reference or intended implementations.

However, I do see merit in a potential way to configure these behaviors. It wouldn't change the API differences, but it would help resolve any unintended errors a developer might experience when swapping backends.

[github-actions]

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