Introduce C library for Pkl (#1238)

This uses native-image to generate a C library for Pkl.
This generated library from native-image is wrapped with our own library,
in `pkl.h`.

This produces a static and a dynamic library for each os/arch variant
that Pkl currently supports.

Co-authored-by: Kushal Pisavadia <kushal.p@apple.com>
Co-authored-by: Jen Basch <jbasch94@gmail.com>
Co-authored-by: Islon Scherer <i_desouzascherer@apple.com>

pkl-commons-test/pkl-commons-test.gradle.kts

@@ -26,7 +26,10 @@ dependencies {
   api(libs.junitApi)
   api(libs.junitEngine)
   api(libs.junitParams)
+  api(libs.wiremock)
   api(projects.pklCommons) // for convenience
+  implementation(projects.pklCore)
+  implementation(projects.pklServer)
   implementation(libs.assertj)
   implementation(libs.msgpack)
 }