…to be deployed in Kubernetes

feat(postgres.yaml): add PostgreSQL configuration for deployment in Kubernetes
feat(productcatalogservice.yaml): add environment variables for PostgreSQL connection details
refactor(skaffold.yaml): comment out loadgenerator configuration
feat(healthcheck): add healthcheck code to connect to productcatalogservice and list products
feat(loadproductdata): add Dockerfile and go.mod for loadproductdata service

feat(loadproductdata): add go.sum file with dependencies for the loadproductdata module
feat(loadproductdata): add main.go file to the loadproductdata module
feat(loadproductdata): add products.json file to the loadproductdata module
feat(productcatalogservice): add dependency on github.com/lib/pq v1.10.9 to the go.mod file
fix(productcatalogservice): update ListProducts method to fetch products from the database instead of parsing a catalog file
fix(productcatalogservice): update GetProduct method to fetch product from the database based on ID
fix(productcatalogservice): update SearchProducts method to search for products in the database based on query string

fix(server.go): remove unused imports and variables to improve code cleanliness
feat(server.go): add support for PostgreSQL database to store product data
feat(server.go): load initial data from JSON file into the database on server startup
feat(server.go): create products table in the database if it doesn't exist
feat(server.go): insert product data into the products table on server startup
feat(server.go): add support for configurable product catalog file path
feat(server.go): pass the database connection to the productCatalog struct to enable database operations
feat(server.go): implement createDatabase function to create a PostgreSQL database if it doesn't exist

…ct guidelines

refactor(product_catalog.go): simplify code by removing unnecessary comments and unused code
refactor(product_catalog.go): improve variable names for better readability
refactor(product_catalog.go): simplify code by removing unnecessary variable assignments
refactor(product_catalog.go): simplify code by removing unnecessary error handling
refactor(product_catalog.go): simplify code by removing unnecessary type conversions
refactor(product_catalog.go): simplify code by removing unnecessary struct initialization
refactor(product_catalog.go): simplify code by removing unnecessary imports