Add ExportOutput test case and snapshots

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: davidwzhao

tests/bin/csv_output.bin

@@ -0,0 +1,14 @@
+(transaction
+  (epoch
+    (writes
+      (define
+        (fragment :frag
+          (def :test
+            ([x::INT]
+              (+ 1 1 x))))))
+
+    (reads
+      (output_export
+        (csv
+          (table_def :test)
+          (csv_config {}))))))

tests/lqp/csv_output.lqp

@@ -0,0 +1,18 @@
+(transaction
+  (configure { :ivm.maintenance_level "off" :semantics_version 0})
+  (epoch
+    (writes (define (fragment :frag (def :test ([x::INT] (+ 1 1 x))))))
+    (reads
+      (output_export
+        (csv
+          (table_def :test)
+          (csv_config
+            {
+             :csv_compression ""
+             :csv_decimal_separator "."
+             :csv_delimiter ","
+             :csv_encoding "utf-8"
+             :csv_escapechar "\""
+             :csv_header_row 1i32
+             :csv_quotechar "\""
+             :csv_skip 0}))))))

tests/pretty/csv_output.lqp

@@ -0,0 +1,25 @@
+(transaction
+  (configure { :ivm.maintenance_level "off" :semantics_version 0})
+  (epoch
+    (writes
+      (define
+        (fragment :frag (def 0xa3bf4f1b2b0b822cd15d6c15b0f00a08 ([x::INT] (+ 1 1 x))))))
+    (reads
+      (output_export
+        (csv
+          (table_def 0xa3bf4f1b2b0b822cd15d6c15b0f00a08)
+          (csv_config
+            {
+             :csv_compression ""
+             :csv_decimal_separator "."
+             :csv_delimiter ","
+             :csv_encoding "utf-8"
+             :csv_escapechar "\""
+             :csv_header_row 1i32
+             :csv_quotechar "\""
+             :csv_skip 0}))))))
+
+;; Debug information
+;; -----------------------
+;; Original names
+;; 	 ID `0xa3bf4f1b2b0b822cd15d6c15b0f00a08` -> `test`