Generate a Python module into JAR files

[mikehearn]

This PR adds usage of the new j2pyi tool in https://github.com/oracle/graalpy-extensions/tree/main/pyinterfacegen to Micronaut Build such that projects get a Python module containing .pyi stubs for GraalPy included into the JAR.

It's not ready to merge yet because the j2pyi tool needs to be released to Maven Central first, and we may need to do more work on the bindings generation to make them high quality enough.

The idea is that some kind of tool can take the Python module out of the JARs and merge them together into a venv.

Testing

I tested micronaut-sql with this new set of plugins locally and it worked. I haven't tested any other module.

[graemerocher]

@mikehearn can you show what you did to test Micronaut SQL, I want to test this against some modules. Thanks

[mikehearn]

I've added a typecheck task. Note that this doesn't work yet because to type check the Python requires resolving the Python/Micronaut dependency graph. However, it is forward progress and lets us rule out syntax errors etc.

To test, use something like this:

cd micronaut-build
./gradlew publishToMavenLocal
cd ../micronaut-sql
cat << 'EOF' | patch -p1
diff --git a/settings.gradle b/settings.gradle
index 39bbb6109..90ef9848d 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -1,5 +1,9 @@
 pluginManagement {
+    // Include the local micronaut-build so all io.micronaut.build.* plugins resolve from our working copy
+    includeBuild("../micronaut-build")
     repositories {
+        // Prefer local builds if we ever need to publishToMavenLocal as a fallback
+        mavenLocal()
         gradlePluginPortal()
         mavenCentral()
     }
EOF
./gradlew jar
tree jdbc/build/graalpy-module
jar tf jdbc/build/libs/micronaut-jdbc-7.0.0-SNAPSHOT.jar|grep graalpy