Add an intermediate experience during dev

[K1DV5]

As it currently stands, there are two supported involvement levels of wuchale as a vite plugin: either fully working doing the extraction, transformation and writing of catalog files etc. or disabled and doing none of those, as if it wasn't installed at all. And that feels like the choice is all-or-nothing.

This proposes a third middle level where code that uses messages that are already in the catalog is transformed to use them, but new messages are not extracted and pass through with no modification. It essentially acts in a sort of read-only mode and no catalog modification happens. (This is the standard behavior of Lingui and other tools where you need to run some command to "detect" new messages.)

Therefore the config surface will change: hmr is renamed to dev and accepts 'full' | 'read' | false.

[changeset-bot]

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[Stadly]

You might want to take #376 into consideration too. Might be useful with an option that does not mark strings as obsolete? Or maybe you can think of a better solution :)