This reverts commit 7f404fff49.
The package is derived from the module name.
Having `module com.example.Foo` in Pkl
will create Kotlin `package com.example`.
Eventually, we may want to introduce a way to map
Pkl names to package names that provides finer
controls to the code generator.
This change activates the `TYPESAFE_PROJECT_ACCESSORS` feature
preview in Gradle, and switches to such accessors instead of
string-based project references, where possible
Relates-To: apple/pkl#204
Signed-off-by: Sam Gammon <sam@elide.ventures>
