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/cli/build.gradle.kts

@@ -12,6 +12,7 @@ dependencies {
     compile(project(":compiler:backend-common"))
     compile(project(":compiler:backend"))
     compile(project(":compiler:backend.jvm"))
+    implementation(project(":compiler:backend.jvm:backend.jvm.entrypoint"))
     compile(project(":compiler:ir.backend.common"))
     compile(project(":compiler:light-classes"))
     compile(project(":compiler:serialization"))