Refactor parseFile function in LibClangParser

Refactored the `parseFile` function in `LibClangParser.kt` to improve file handling. The function now validates if the file exists before parsing and supports parsing with file object besides file name. The changes enhance error prevention and enable more flexible file handling options.

klang/klang/src/main/kotlin/klang/parser/libclang/LibClangParser.kt

@@ -1,11 +1,20 @@
 package klang.parser.libclang
 
+import klang.DeclarationRepository
+import java.io.File
+
 enum class ParserTechnology {
 	JNA,
 	Panama
 }
 
-fun parseFile(file: String, parserTechnology: ParserTechnology = ParserTechnology.Panama) = when (parserTechnology) {
-	ParserTechnology.JNA -> parseFileWithJna(file)
-	ParserTechnology.Panama -> parseFileWithPanama(file)
+fun parseFile(fileAsString: String, parserTechnology: ParserTechnology = ParserTechnology.Panama): DeclarationRepository {
+	val file = File(fileAsString)
+	assert(file.exists())
+	return parseFile(file, parserTechnology)
+}
+
+internal fun parseFile(file: File, parserTechnology: ParserTechnology = ParserTechnology.Panama) = when (parserTechnology) {
+	ParserTechnology.JNA -> parseFileWithJna(file.absolutePath)
+	ParserTechnology.Panama -> parseFileWithPanama(file.absolutePath)
 }