[FIR] Create context and scope for incremental compilation separately

Scope for incremental compilation refers to binaries from previous step
  of IC. It is used not only in IC context itself, but also it is
  subtracted from original libraries scope. Before previous commit there
  was such scheme:
1. create incremental compilation context for files of specific session
2. subtract IC scope from main libraries scope
3. use updated libraries scope to create library session
4. create all needed source session(s)

So here was a side effect of creating new IC context, which
1. is smelling code, because it increases mind complexity
2. hard to implement with new session utilities

So to fix this problem this commit changes the scheme above:
1. create IC scope and modify libraries scope
2. create libraries session
3. create source session(s) and IC context for them

plugins/scripting/scripting-compiler/src/org/jetbrains/kotlin/scripting/compiler/plugin/impl/ScriptJvmCompilerImpls.kt

@@ -339,18 +339,12 @@ private fun doCompileWithK2(
     val projectEnvironment = context.environment.toAbstractProjectEnvironment()
     val compilerEnvironment = ModuleCompilerEnvironment(projectEnvironment, diagnosticsReporter)
 
-    val sourcesScope = compilerEnvironment.projectEnvironment.getSearchScopeBySourceFiles(sources)
     var librariesScope = projectEnvironment.getSearchScopeForProjectLibraries()
-    val providerAndScopeForIncrementalCompilation = createContextForIncrementalCompilation(
+    val incrementalCompilationScope = createIncrementalCompilationScope(
         compilerInput.configuration,
         projectEnvironment,
-        sourcesScope,
-        emptyList(),
-        null
-    )?.also { (_, _, precompiledBinariesFileScope) ->
-        precompiledBinariesFileScope?.let { librariesScope -= it }
-    }
-
+        incrementalExcludesScope = null
+    )?.also { librariesScope -= it }
     val extensionRegistrars = (projectEnvironment as? VfsBasedProjectEnvironment)
         ?.let { FirExtensionRegistrar.getInstances(it.project) }
         .orEmpty()
@@ -364,7 +358,15 @@ private fun doCompileWithK2(
     val session = prepareJvmSessions(
         sourceFiles, kotlinCompilerConfiguration, projectEnvironment, rootModuleName, extensionRegistrars,
         librariesScope, libraryList, isCommonSourceForPsi, fileBelongsToModuleForPsi,
-        createProviderAndScopeForIncrementalCompilation = { providerAndScopeForIncrementalCompilation }
+        createProviderAndScopeForIncrementalCompilation = { files ->
+            createContextForIncrementalCompilation(
+                compilerInput.configuration,
+                projectEnvironment,
+                compilerEnvironment.projectEnvironment.getSearchScopeBySourceFiles(files.map { KtPsiSourceFile(it) }),
+                emptyList(),
+                incrementalCompilationScope
+            )
+        }
     ).single().session
 
     session.scriptDefinitionProviderService?.run {