Implement metadata upload from Kudaflib-CLI directly to Kudaf-Metadata backend and upload DBH metadata

Definition of Done:

• CLI is YAML file Catalog (and Organization), Dataset, Unit Type and Variable metadata
• CLI reads API_KEY and Target system (DEV, STAGING, PRODUCTION) from local environment variable (or .env file)
• CLI triggers Kudaf-Metadata endpoints to create Catalogs, Datasets, Unit Types and Variables
• Modify Kudaf-Metadata backend logic/security to add possibility to operate via API-Key, modify schemas as needed, etc
• Upload HKDIR's DBH metadata (15 variales from Microdata) via CLI to Kudaf-Metadata Staging/Prod
• Further work:
  • Add command option to the CLI to upload the metadata
  • Refactor logic to process nested YAML file (instead of sequential)
  • Add possibility to input the API-key manually when running the program, or specify it in the command line
  • Add more detailed documentation to README file
  • Build new package version 0.2 and publish