Automatically add Babashka facet if directory contains bb.edn

[devurandom]

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It would be nice if Cursive would use the bb.edn project file (https://book.babashka.org/#project-setup) to automatically recognise Babashka modules (i.e. add a Babashka facet), simplifying the steps needed to set up a Babashka project in Cursive (https://cursive-ide.com/userguide/babashka.html).

Other requests to simplify working with Babashka:

• https://github.com/cursive-ide/cursive/issues/2850
• https://github.com/cursive-ide/cursive/issues/3017