This extension can be used to override resolution of assign statements
with custom logic
WARNING: there is no compatibility guarantees for this extension
FirExtensionRegistrar is FIR specific extension which requires FIR
classes to work, which are missing in dependencies of FE 1.0 IDE plugin.
To fix this issue FirExtensionRegistrarAdapter is introduced. This
class is a base class for FirExtensionRegistrar and it does not have
any FIR specific classes in it's API, so it can be safely registered
in IDE
This commit addresses 1243c641296e74a572a4f274df72a4cda60635c6 in intellij
In intellij they added registration of "com.intellij.psi.classFileDecompiler" in
`JavaCoreApplicationEnvironment`. And because the `KotlinCoreApplicationEnvironment` inherits
`JavaCoreApplicationEnvironment` we don't need to register this EP ourselves.
This commit fixes in 203 tests + 1.4.30 compiler:
```
java.lang.RuntimeException: Duplicate registration for EP 'com.intellij.psi.classFileDecompiler': first in com.intellij.openapi.extensions.DefaultPluginDescriptor@44f464d1, second in PluginDescriptor(name=org.jetbrains.kotlin, id=org.jetbrains.kotlin, path=/home/builduser/.m2/repository/org/jetbrains/kotlin/kotlin-compiler-for-ide/1.4.30-M1-30/kotlin-compiler-for-ide-1.4.30-M1-30.jar, version=1.2)
at com.intellij.openapi.components.ComponentManager.createError(ComponentManager.java:167)
at com.intellij.openapi.extensions.impl.ExtensionsAreaImpl.registerExtensionPoints(ExtensionsAreaImpl.java:262)
at com.intellij.ide.plugins.PluginManagerCore.registerExtensionPointAndExtensions(PluginManagerCore.java:1334)
...
```
instead of statically registering it.
Static registering can cause subtle errors when plugin implementation
(e.g. SerializationDescriptorPluginForKotlinxSerialization) is registered
from multiple classloaders: in multi-module with daemon compilation scenario
#KT-41857 Fixed
Dmitriy Novozhilov