Load icu extension by default (#512)

Fixes comparisons/operators of the `timestamp with timezone` type.

Fixes #490

test/regression/expected/extensions.out

@@ -2,8 +2,9 @@ SET duckdb.force_execution TO false;
 SELECT * FROM duckdb.raw_query($$ SELECT extension_name, loaded, installed FROM duckdb_extensions() WHERE loaded and extension_name != 'jemalloc' $$);
 NOTICE:  result: extension_name	loaded	installed	
 VARCHAR	BOOLEAN	BOOLEAN	
-[ Rows: 4]
+[ Rows: 5]
 cached_httpfs	true	true
+icu	true	true
 json	true	true
 parquet	true	true
 pgduckdb	true	false

test/regression/expected/timestamp_with_interval.out

@@ -0,0 +1,12 @@
+CREATE TABLE recently_created_table(a VARCHAR);
+INSERT INTO recently_created_table VALUES ('latest 1'), ('latest 2'), ('latest 3');
+select 1 as result
+FROM recently_created_table
+WHERE  timestamp with time zone '2024-12-10 13:59:59.776896+00' < CAST((NOW() + INTERVAL '1 day') AS date)
+LIMIT 1;
+ result 
+--------
+      1
+(1 row)
+
+drop table recently_created_table;

test/regression/schedule

@@ -26,4 +26,5 @@ test: transaction_errors
 test: secrets
 test: prepare
 test: function
+test: timestamp_with_interval
 test: approx_count_distinct

test/regression/sql/timestamp_with_interval.sql

@@ -0,0 +1,9 @@
+CREATE TABLE recently_created_table(a VARCHAR);
+INSERT INTO recently_created_table VALUES ('latest 1'), ('latest 2'), ('latest 3');
+
+select 1 as result
+FROM recently_created_table
+WHERE  timestamp with time zone '2024-12-10 13:59:59.776896+00' < CAST((NOW() + INTERVAL '1 day') AS date)
+LIMIT 1;
+
+drop table recently_created_table;

third_party/pg_duckdb_extensions.cmake

@@ -1,4 +1,5 @@
 duckdb_extension_load(json)
+duckdb_extension_load(icu)
 # This is relative to third_party/duckdb dir
 duckdb_extension_load(cached_httpfs
     SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../cached_httpfs"