JVM IR: remove dependency of 'backend.jvm' on 'psi2ir', 'ir.serialization.jvm'

Add a new module 'backend.jvm.entrypoint' which depends on psi2ir and
contains code that runs psi2ir + JVM IR backend with serialization
implementations.

Hopefully this will allow to compile these modules in parallel and
reduce the build time.

compiler/fir/entrypoint/build.gradle.kts

@@ -12,6 +12,9 @@ dependencies {
     api(project(":compiler:fir:fir2ir"))
     api(project(":compiler:fir:checkers"))
 
+    // TODO: do not use GeneratorExtensions in `FirAnalyzerFacade.convertToIr`, and make this an 'implementation' dependency.
+    api(project(":compiler:ir.psi2ir"))
+
     implementation(project(":compiler:fir:resolve"))
     implementation(project(":compiler:fir:fir2ir:jvm-backend"))
     implementation(project(":compiler:backend.jvm"))