feat(router): Unify Auth in single layer (V2)

[AnuthaDev]

In-efficiency in design

• Currently we have many types of auth and auth is evaluated in multiple places, with multiple ways.
• This indeed required multiple approaches and solution needs to be maintained
• More cognitive load
• We can’t authenticate a request in one infra component/layer

Unify Auth in single layer

• Make Authentication header like,
  • authorization: key=value, keyN=valueN
  • Examples:
    • authorization: api-key=
    • authorization: publishable-key=, client-secret=
    • authorization: publishable-key=, ephemeral-key=
    • authorization: jwt=
• Lineage also should be added in headers, when we can’t inferable from authorization
  • profile_id should be added in headers not in body
  • If api-key not passed or the passed api-key has different scope, then merchant-id also should be passed.