Add serde support for CSV FileTypeWriterOptions (#8641)

datafusion/proto/proto/datafusion.proto

@@ -1207,6 +1207,7 @@ message FileTypeWriterOptions {
   oneof FileType {
     JsonWriterOptions json_options = 1;
     ParquetWriterOptions parquet_options = 2;
+    CsvWriterOptions csv_options = 3;
   }
 }
 
@@ -1218,6 +1219,23 @@ message ParquetWriterOptions {
     WriterProperties writer_properties = 1;
 }
 
+message CsvWriterOptions {
+  // Optional column delimiter. Defaults to `b','`
+  string delimiter = 1;
+  // Whether to write column names as file headers. Defaults to `true`
+  bool has_header = 2;
+  // Optional date format for date arrays
+  string date_format = 3;
+  // Optional datetime format for datetime arrays
+  string datetime_format = 4;
+  // Optional timestamp format for timestamp arrays
+  string timestamp_format = 5;
+  // Optional time format for time arrays
+  string time_format = 6;
+  // Optional value to represent null
+  string null_value = 7;
+}
+
 message WriterProperties {
   uint64 data_page_size_limit = 1;
   uint64 dictionary_page_size_limit = 2;