Added test case for Adapter

1. Removed config files from config folder.
2. Added test cases for the Adapter with code coverage of 91%.
3. Resolved linting issues.

config/sellerData.yaml

@@ -1,69 +0,0 @@
-- id: pooja-stores
-  descriptor:
-    name: Pooja Stores
-  locations:
-    - id: koramangala-4th-block-location
-      gps: "12.9349377,77.6055586"
-  categories:
-    - id: fresh_fruits
-      descriptor:
-        name: Fresh Fruits
-    - id: beverages
-      descriptor:
-        name: Beverages
-  items:
-    - id: item_2
-      descriptor:
-        name: Green Apples Organic
-        images:
-          - url: "https://mock_bpp.com/images/item_2.jpg"
-      category_id: fresh_fruits
-      location_id: koramangala-4th-block-location
-      price:
-        currency: INR
-        value: "170"
-      matched: true
-    - id: item_1
-      descriptor:
-        name: Red Apples
-        images:
-          - url: "https://mock_bpp.com/images/item_1.jpg"
-      category_id: fresh_fruits
-      location_id: koramangala-4th-block-location
-      price:
-        currency: INR
-        value: "90"
-      related: true
-    - id: item_7
-      descriptor:
-        name: Green Apple Juice
-        images:
-          - url: "https://mock_bpp.com/images/item_7.jpg"
-      category_id: beverages
-      location_id: koramangala-4th-block-location
-      price:
-        currency: INR
-        value: "70"
-      matched: true
-- id: food-mall
-  descriptor:
-    name: Food Mall
-  locations:
-    - id: food-mall-location
-      gps: "12.9349377,77.6055586"
-  categories:
-    - id: fresh-food
-      descriptor:
-        name: Fresh food
-  items:
-    - id: item_1_1
-      descriptor:
-        name: Green Apple Salad
-        images:
-          - url: "https://mock_bpp.com/images/item_1_1.jpg"
-      category_id: fresh-food
-      location_id: food-mall-location
-      price:
-        currency: INR
-        value: "200"
-      matched: true