Chore: add new test using source-pokeapi and custom components.py (#317)

Author: aaronsteers

unit_tests/source_declarative_manifest/resources/source_pokeapi_w_components_py/README.md

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+# PokeAPI with Custom `components.py` API Tests
+
+This test connector is a modified version of `source-pokeapi`. It has been modified to use custom `components.py` so we have a test case the completes quickly and _does not_ require any credentials.

unit_tests/source_declarative_manifest/resources/source_pokeapi_w_components_py/components.py

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+"""A sample implementation of custom components that does nothing but will cause syncs to fail if missing."""
+
+from typing import Any, Mapping
+
+import requests
+
+from airbyte_cdk.sources.declarative.extractors import DpathExtractor
+
+
+class IntentionalException(Exception):
+    """This exception is raised intentionally in order to test error handling."""
+
+
+class MyCustomExtractor(DpathExtractor):
+    """Dummy class, directly implements DPatchExtractor.
+
+    Used to prove that SDM can find the custom class by name.
+    """
+
+    pass

unit_tests/source_declarative_manifest/resources/source_pokeapi_w_components_py/components_failing.py

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+#
+# Copyright (c) 2023 Airbyte, Inc., all rights reserved.
+#
+"""A sample implementation of custom components that does nothing but will cause syncs to fail if missing."""
+
+from collections.abc import Iterable, MutableMapping
+from dataclasses import InitVar, dataclass
+from typing import Any, Mapping, Optional, Union
+
+import requests
+
+from airbyte_cdk.sources.declarative.extractors import DpathExtractor
+
+
+class IntentionalException(Exception):
+    """This exception is raised intentionally in order to test error handling."""
+
+
+class MyCustomExtractor(DpathExtractor):
+    def extract_records(
+        self,
+        response: requests.Response,
+    ) -> Iterable[MutableMapping[Any, Any]]:
+        raise IntentionalException