feat(source-pokeapi): Switch pokemon stream to use InferredSchemaLoader

This commit replaces the InlineSchemaLoader with the new InferredSchemaLoader
on the pokemon stream. The InferredSchemaLoader will read 1 sample record at
discover time and infer the schema using genson.

This demonstrates the end-to-end functionality of the InferredSchemaLoader
feature from CDK PR airbytehq/airbyte-python-cdk#831.

Expected behavior:
- Discover should return a non-empty schema inferred from the sample record
- Schema may include nullable unions (e.g., ["string", "null"]) from genson
- Read operations should continue to work with the inferred schema

Related: airbytehq/airbyte-python-cdk#831
Co-Authored-By: AJ Steers <aj@airbyte.io>

Author: devin-ai-integration[bot]

airbyte-integrations/connectors/source-pokeapi/manifest.yaml

@@ -26,9 +26,19 @@ definitions:
             type: DpathExtractor
             field_path: []
       schema_loader:
-        type: InlineSchemaLoader
-        schema:
-          $ref: "#/schemas/pokemon"
+        type: InferredSchemaLoader
+        record_sample_size: 1
+        retriever:
+          type: SimpleRetriever
+          requester:
+            $ref: "#/definitions/base_requester"
+            path: /{{config['pokemon_name']}}
+            http_method: GET
+          record_selector:
+            type: RecordSelector
+            extractor:
+              type: DpathExtractor
+              field_path: []
   base_requester:
     type: HttpRequester
     url_base: https://pokeapi.co/api/v2/pokemon