[Compiler plugin ] Support ColumnName annotation in extension properties codegen

[koperagen]

Before this PR this code would fail with "abc is not found in dataframe" at runtime. After, behavior will be aligned with KSP

@DataSchema data class Record( @ColumnName("a") val abc: String, ) fun box(): String { val df = dataFrameOf("a")(1).cast<Record>() df.abc return "OK" }