Fix handling of file: module URIs with non-ASCII characters (#696)

Addresses an issue where Pkl cannot evaluate files with non-ASCII characters.

pkl-cli/src/test/kotlin/org/pkl/cli/CliEvaluatorTest.kt

@@ -1457,6 +1457,62 @@ result = someLib.x
     assertThat(output).isEqualTo("result = 1\n")
   }
 
+  @Test
+  fun `eval file with non-ASCII name`() {
+    val tempDirUri = tempDir.toUri()
+    val dir = tempDir.resolve("🤬").createDirectory()
+    val file =
+      writePklFile(
+        dir.resolve("日本語.pkl").toString(),
+        """
+      日本語 = "Japanese language"
+      readDir = read(".").text
+      readDirFile = read("$tempDirUri🤬").text
+      readOne = read("日本語.pkl").text.split("\n").first
+      readOneFile = read("$tempDirUri🤬/日本語.pkl").text.split("\n").first
+      readGlob = read*("./日*.pkl").keys
+      readGlobFile = read*("$tempDirUri**/*.pkl").keys.map((it) -> it.replaceAll("$tempDirUri".replaceAll("///", "/"), ""))
+      importOne = import("日本語.pkl").readOne
+      importOneFile = import("$tempDirUri🤬/日本語.pkl").日本語
+      importGlob = import*("./日*.pkl").keys
+      importGlobFile = import*("$tempDirUri**/*.pkl").keys.map((it) -> it.replaceAll("$tempDirUri".replaceAll("///", "/"), ""))
+    """
+          .trimIndent()
+      )
+    val output =
+      evalToConsole(
+        CliEvaluatorOptions(
+          CliBaseOptions(sourceModules = listOf(file)),
+        )
+      )
+
+    val tripleQuote = "\"\"\""
+    assertThat(output)
+      .isEqualTo(
+        """
+        日本語 = "Japanese language"
+        readDir = $tripleQuote
+          日本語.pkl
+          
+          $tripleQuote
+        readDirFile = $tripleQuote
+          日本語.pkl
+          
+          $tripleQuote
+        readOne = "日本語 = \"Japanese language\""
+        readOneFile = "日本語 = \"Japanese language\""
+        readGlob = Set("./日本語.pkl")
+        readGlobFile = Set("🤬/日本語.pkl")
+        importOne = "日本語 = \"Japanese language\""
+        importOneFile = "Japanese language"
+        importGlob = Set("./日本語.pkl")
+        importGlobFile = Set("🤬/日本語.pkl")
+        
+        """
+          .trimIndent()
+      )
+  }
+
   private fun evalModuleThatImportsPackage(certsFile: Path?, testPort: Int = -1) {
     val moduleUri =
       writePklFile(