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/ir/backend.jvm/build.gradle.kts

@@ -7,9 +7,7 @@ dependencies {
     compile(project(":kotlin-annotations-jvm"))
     compile(project(":compiler:backend"))
     compile(project(":compiler:ir.tree"))
-    compile(project(":compiler:ir.psi2ir"))
     compile(project(":compiler:ir.backend.common"))
-    compile(project(":compiler:ir.serialization.jvm"))
     api(project(":compiler:backend.common.jvm"))
     compileOnly(project(":compiler:ir.tree.impl"))
     compileOnly(intellijCoreDep()) { includeJars("intellij-core", "asm-all", "guava", rootProject = rootProject) }