✨ feature/adapters

[CookieCookson]

Adds the option to specify the adapter used when making network requests. Supports axios (default), fetch or provide a custom fetcher method.

• [x] Add adapter structure
• [x] Add Axios adapter
• [x] Add Fetch adapter
• [x] Add custom adapter function
• [x] Update existing unit tests with adapter variants
• [x] Update existing integration tests with adapter variants
• [x] Add additional tests for adapters
  • [x] Axios
  • [x] Fetch
  • [x] Custom
• [x] Add edge jest environment
  • Blocked by https://github.com/vercel/edge-runtime/issues/250)
• [x] Support base64 conversion for toBasicAuth in edge environment