Enable quotes by default

[andrefurlan-db]

Description

When working with the Unity Catalog, it is very convenient to quote catalog, schema, or identifiers so generated catalog and schema names work without extra configuration.

resolves #240

Checklist

• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have updated the CHANGELOG.md and added information about my change to the "dbt-databricks next" section.

[ueshin]

Shall we reuse test_relation.py for the unit test.

e.g.,

diff --git a/tests/unit/test_relation.py b/tests/unit/test_relation.py
index 7db1cc5..e5ce504 100644
--- a/tests/unit/test_relation.py
+++ b/tests/unit/test_relation.py
@@ -8,7 +8,6 @@ from dbt.adapters.databricks.relation import DatabricksRelation
 class TestDatabricksRelation(unittest.TestCase):
     def test_pre_deserialize(self):
         data = {
-            "quote_policy": {"database": False, "schema": False, "identifier": False},
             "path": {
                 "database": "some_database",
                 "schema": "some_schema",
@@ -21,6 +20,7 @@ class TestDatabricksRelation(unittest.TestCase):
         self.assertEqual(relation.database, "some_database")
         self.assertEqual(relation.schema, "some_schema")
         self.assertEqual(relation.identifier, "some_table")
+        self.assertEqual(relation.render(), "`some_database`.`some_schema`.`some_table`")

         data = {
             "quote_policy": {"database": False, "schema": False, "identifier": False},

and same for the following tests.