[Analysis API] fix resolution to declarations inside kotlin*. packages

`kotlin*.` packages should be always allowed.
`kotlin.` packages should be allowed if `AnalysisFlags.allowKotlinPackage` is `true`

^KT-63223 fixed

analysis/analysis-api/testData/referenceResolve/kotlinPackage/kotlinxPackage.kt

@@ -0,0 +1,12 @@
+// FILE: a.kt
+package kotlinx.pckg
+
+fun foo() {
+    b<caret>ar()
+}
+
+// FILE: b.kt
+package kotlinx.pckg
+
+fun bar() {
+}

analysis/analysis-api/testData/referenceResolve/kotlinPackage/kotlinxPackage.txt

@@ -0,0 +1,2 @@
+Resolved to:
+0: (in kotlinx.pckg) fun bar()