Add test for adjacent string literals preservation

I added a unit test to assert the specific case you reported.
Added test in modules/database-commons/src/test/java/org/testcontainers/ext/ScriptSplittingTest.java:
testAdjacentStringLiteralsSeparatedByNewlineArePreserved checks that:
- CREATE TABLE collapses newlines to spaces.
- COMMENT ON COLUMN ... IS 'First sentence. '\n'Second sentence' preserves the required newline between quoted strings.

Author: marktech0813

modules/database-commons/src/test/java/org/testcontainers/ext/ScriptSplittingTest.java

@@ -21,6 +21,25 @@ void testStringDemarcation() {
         splitAndCompare(script, expected);
     }
 
+	@Test
+	void testAdjacentStringLiteralsSeparatedByNewlineArePreserved() {
+		String script =
+			"CREATE TABLE test (\n" +
+			"    x int\n" +
+			");\n" +
+			"\n" +
+			"COMMENT ON COLUMN test.x\n" +
+			"    IS 'First sentence. '\n" +
+			"    'Second sentence';";
+
+		List<String> expected = Arrays.asList(
+			"CREATE TABLE test ( x int )",
+			"COMMENT ON COLUMN test.x IS 'First sentence. '\n'Second sentence'"
+		);
+
+		splitAndCompare(script, expected);
+	}
+
     @Test
     void testIssue1547Case1() {
         String script =