This PR adds the `PackageDescription.Basic` module, available to
Package.juvix files.
```
module Package;
import PackageDescription.Basic open;
package : Package := basicPackage;
```
The `PackageDescription.Basic` module provides a Package type that is
translated to a Juvix Package with all default arguments. It is not
possible to customize a basic package.
A basic package does not depend on the standard library, so loads much
more quickly.
Additionally this PR:
* Adds `juvix init --basic/-b` option to generate a basic Package.juvix.
* Migrates Package.juvix files that only use default arguments, or only
customise the name field, to basic Package files.
* Closes https://github.com/anoma/juvix/issues/2508
This PR:
* Modifies entry point `_entryPointBuildDir` to use the `BuildDir` type
instead of `SomeBase Dir`. This allows delayed resolution of the default
build directory which was useful for the Package -> Concrete translation
point below.
* Modifies `juvix dev root` to render the current package as a
Package.juvix file.
* Modifies the Package -> Concrete translation to recognise default
arguments. So, for example, an empty `juvix.yaml` file will be
translated into the following (instead of the `name`, `version`, and
`dependencies` arguments being populated).
module Package;
import Stdlib.Prelude open;
import PackageDescription.V1 open;
package : Package := defaultPackage;
* Adds a temporary command (removed when juvix.yaml support is removed)
`juvix dev migrate-juvix-yaml` that translates `juvix.yaml` into an
equivalent `Package.juvix` in the current project.
* Adds a temporary script `migrate-juvix-yaml.sh` (removed when
juvix.yaml support is removed) which can be run in the project to
translate all Juvix projects in the repository.
* Actually translate all of the `juvix.yaml` files to `Package.juvix`
using the script.
* Part of https://github.com/anoma/juvix/issues/2487
