Remove legacy functions

Remove _timescaledb_internal.time_col_name_for_chunk and
_timescaledb_internal.time_col_type_for_chunk functions.

Fixes #3539

sql/schema_info.sql

@@ -55,46 +55,3 @@ $BODY$
     FROM _timescaledb_catalog.hypertable h
     WHERE id = hypertable_id;
 $BODY$;
-
-
--- Get the name of the time column for a chunk.
---
--- schema_name, table_name - name of the schema and table for the table represented by the crn.
-CREATE OR REPLACE FUNCTION _timescaledb_internal.time_col_name_for_chunk(
-    schema_name NAME,
-    table_name  NAME
-)
-    RETURNS NAME LANGUAGE PLPGSQL STABLE AS
-$BODY$
-DECLARE
-    time_col_name NAME;
-BEGIN
-    SELECT h.time_column_name INTO STRICT time_col_name
-    FROM _timescaledb_catalog.hypertable h
-    INNER JOIN _timescaledb_catalog.chunk c ON (c.hypertable_id = h.id)
-    WHERE c.schema_name = time_col_name_for_chunk.schema_name AND
-    c.table_name = time_col_name_for_chunk.table_name;
-    RETURN time_col_name;
-END
-$BODY$;
-
--- Get the type of the time column for a chunk.
---
--- schema_name, table_name - name of the schema and table for the table represented by the crn.
-CREATE OR REPLACE FUNCTION _timescaledb_internal.time_col_type_for_chunk(
-    schema_name NAME,
-    table_name  NAME
-)
-    RETURNS REGTYPE LANGUAGE PLPGSQL STABLE AS
-$BODY$
-DECLARE
-    time_col_type REGTYPE;
-BEGIN
-    SELECT h.time_column_type INTO STRICT time_col_type
-    FROM _timescaledb_catalog.hypertable h
-    INNER JOIN _timescaledb_catalog.chunk c ON (c.hypertable_id = h.id)
-    WHERE c.schema_name = time_col_type_for_chunk.schema_name AND
-    c.table_name = time_col_type_for_chunk.table_name;
-    RETURN time_col_type;
-END
-$BODY$;

sql/updates/latest-dev.sql

@@ -0,0 +1,2 @@
+DROP FUNCTION _timescaledb_internal.time_col_name_for_chunk(name,name);
+DROP FUNCTION _timescaledb_internal.time_col_type_for_chunk(name,name);