fix: dry-run bug when running configs, added CODEOWNERS, and docs

CODEOWNERS

@@ -0,0 +1,13 @@
+# Order is important; the last matching pattern takes the most
+# precedence.
+
+# The main branch in this repo is protected and requires reviews
+# from code owners. This means that any pull request
+# which affects code with a code owner must be approved
+# by that code owner before the pull request can be merged
+# into the protected branch.
+
+# Pull requests which modify any of the following 
+# file types must be approved by one of the listed owner(s):
+
+*.py    @GoogleCloudPlatform/pso-code-review-committee

data_validation/__main__.py

@@ -466,7 +466,7 @@ def run_validations(args, config_managers):
                 )
             except Exception as e:
                 logging.error(
-                    "Error %s occured while running config file %s. Skipping it for now.",
+                    "Error %s occurred while running config file %s. Skipping it for now.",
                     str(e),
                     config_manager.config[consts.CONFIG_FILE],
                 )

data_validation/cli_tools.py

@@ -327,6 +327,12 @@ def _configure_validation_config_parser(subparsers):
     run_parser = configs_subparsers.add_parser(
         "run", help="Run your validation configs"
     )
+    run_parser.add_argument(
+        "--dry-run",
+        "-dr",
+        action="store_true",
+        help="Prints source and target SQL to stdout in lieu of performing a validation.",
+    )
     run_parser.add_argument(
         "--config-file",
         "-c",