Provide a default txt file transformer

[LostLuma]

🙋 feature request

@parcel/config-default should provide a transformer for txt files, mimicking Parcel v1 behavior.

🤔 Expected Behavior

Including one or more txt files in a build should include them in the build output w/o configuration.

😯 Current Behavior

No transformer is supplied in the default config.
Building instead yields @parcel/core: No transformers found for public/test.txt.

💁 Possible Solution

Use @parcel/transformer-raw for txt files in the default config.

🔦 Context

I'm trying to include static text files (such as robots.txt, as well as others) in my project.
In Parcel v1 I did not need to configure Parcel on my own to achieve this, however in Parcel v2 I do.

💻 Examples

Not applicable.

[github-actions]

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[LostLuma]

🫠