Registers new provider credentials for a company.

A company can have got none, one or multiple provider credentials and this endpoint register new provider credentials for a company.
The providers that we manage at this moment with credentials are: 'cartrack' and 'targa'.
Register provider credentials with:

• data
• provider
• auto_import
• company_oid

For each provider we need the following data:

• Cartrack: 'url' and 'token'
• Targa: 'client_id' and 'client_secret'