KT-57468 Kotlin assignment plugin: operation name cannot be found

The problem results in broken import quick fix and import optimizer on
the IDE side [1].

`AssignResolutionAltererExtension` introduced a possibility to override
 resolution of assignment statements. The inconsistency though is
 that `KtSimpleNameReference.getResolvesByNames` doesn't return a name
 for the overridden `=`. Kotlin as a language doesn't support this [2].

This commit eliminates the drawback above:
1. It fixes the name `assign` the `=` can be resolved to [3].
   This eliminates the need to search for the name, bypassing the
   plugins.
2. `KtSimpleNameReference.getResolvesByNames` returns `assign` among
   other names in case it deals with binary `=` and assignment is
   resolved.
3. `KtCompilerPluginsProvider` was extended to check plugins' presence.
   K1 implementation added.

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[1]: https://youtrack.jetbrains.com/issue/KTIJ-24390
[2]: OperatorConventions.getNameForOperationSymbol
     https://kotlinlang.org/docs/operator-overloading.html#augmented-assignments
[3]: OperatorConventions#ASSIGN_METHOD + AssignmentPluginNames

analysis/kt-references/kt-references-fe10/src/org/jetbrains/kotlin/references/fe10/KtFe10SimpleNameReference.kt

@@ -7,14 +7,14 @@ package org.jetbrains.kotlin.references.fe10
 
 import com.intellij.psi.PsiElement
 import com.intellij.util.SmartList
-import org.jetbrains.kotlin.references.fe10.base.KtFe10Reference
-import org.jetbrains.kotlin.references.fe10.base.KtFe10ReferenceResolutionHelper
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
 import org.jetbrains.kotlin.idea.references.KtSimpleNameReference
 import org.jetbrains.kotlin.idea.references.readWriteAccess
 import org.jetbrains.kotlin.load.java.descriptors.JavaPropertyDescriptor
 import org.jetbrains.kotlin.plugin.references.SimpleNameReferenceExtension
 import org.jetbrains.kotlin.psi.*
+import org.jetbrains.kotlin.references.fe10.base.KtFe10Reference
+import org.jetbrains.kotlin.references.fe10.base.KtFe10ReferenceResolutionHelper
 import org.jetbrains.kotlin.resolve.BindingContext
 import org.jetbrains.kotlin.resolve.ImportedFromObjectCallableDescriptor
 import org.jetbrains.kotlin.resolve.descriptorUtil.getImportableDescriptor
@@ -98,4 +98,4 @@ class KtFe10SimpleNameReference(expression: KtSimpleNameExpression) : KtSimpleNa
         }
         return null
     }
-}
+}