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.

settings.gradle

@@ -106,6 +106,7 @@ include ":benchmarks",
         ":compiler:backend.js",
         ":compiler:backend.wasm",
         ":compiler:backend.jvm",
+        ":compiler:backend.jvm:backend.jvm.entrypoint",
         ":compiler:backend-common",
         ":compiler:backend",
         ":compiler:plugin-api",
@@ -483,6 +484,7 @@ project(':compiler:ir.backend.common').projectDir = "$rootDir/compiler/ir/backen
 project(':compiler:backend.js').projectDir = "$rootDir/compiler/ir/backend.js" as File
 project(':compiler:backend.wasm').projectDir = "$rootDir/compiler/ir/backend.wasm" as File
 project(':compiler:backend.jvm').projectDir = "$rootDir/compiler/ir/backend.jvm" as File
+project(':compiler:backend.jvm:backend.jvm.entrypoint').projectDir = "$rootDir/compiler/ir/backend.jvm/entrypoint" as File
 project(':compiler:ir.serialization.common').projectDir = "$rootDir/compiler/ir/serialization.common" as File
 project(':compiler:ir.serialization.jvm').projectDir = "$rootDir/compiler/ir/serialization.jvm" as File
 project(':compiler:ir.serialization.js').projectDir = "$rootDir/compiler/ir/serialization.js" as File