consolidate timestamp macros (#480)

* add mypy ignore to column, connections and init

* consolidate timestamp macros

* add changie

* Update Features-20220926-123609.yaml

* add backcompat to test fixture

* remove current_timestamp_in_utc

* add expected_sql

* remove backcompat from test_timestamps.py

* update dev-requirements

* Update change log body

* lower case timestamps

.changes/unreleased/Features-20220926-123609.yaml

@@ -0,0 +1,7 @@
+kind: Features
+body: Migrate dbt-utils current_timestamp macros into core + adapters
+time: 2022-09-26T12:36:09.319981-07:00
+custom:
+  Author: colin-rogers-dbt
+  Issue: "483"
+  PR: "480"

dbt/include/spark/macros/adapters.sql

@@ -209,10 +209,6 @@
   {{ return(load_result('list_schemas').table) }}
 {% endmacro %}
 
-{% macro spark__current_timestamp() -%}
-  current_timestamp()
-{%- endmacro %}
-
 {% macro spark__rename_relation(from_relation, to_relation) -%}
   {% call statement('rename_relation') -%}
     {% if not from_relation.type %}

dbt/include/spark/macros/utils/timestamps.sql

@@ -0,0 +1,3 @@
+{% macro spark__current_timestamp() -%}
+    current_timestamp()
+{%- endmacro %}

tests/functional/adapter/utils/test_timestamps.py

@@ -0,0 +1,18 @@
+import pytest
+from dbt.tests.adapter.utils.test_timestamps import BaseCurrentTimestamps
+
+
+class TestCurrentTimestampSpark(BaseCurrentTimestamps):
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {"get_current_timestamp.sql": "select {{ current_timestamp() }} as current_timestamp"}
+
+    @pytest.fixture(scope="class")
+    def expected_schema(self):
+        return {
+            "current_timestamp": "timestamp"
+        }
+
+    @pytest.fixture(scope="class")
+    def expected_sql(self):
+        return """select current_timestamp() as current_timestamp"""