Tested KT-2718 Package names that match Kotlin keywords should be escaped properly

idea/testData/editor/optimizeImports/KeywordNames.dependency.kt

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+package foo.`val`
+
+class `var`

idea/testData/editor/optimizeImports/KeywordNames.kt

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+import foo.`val`.*
+
+var v: `var`? = null

idea/testData/editor/optimizeImports/KeywordNames.kt.after

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+import foo.`val`.`var`
+
+var v: `var`? = null