[NV-3038] Migrate from @sendinblue/client SDK to direct API calls with Axios

[LetItRock]

What?

In the @novu/sendinblue package we would like to migrate from using the @sendinblue/client SDK to having a code that directly calls to the provider APIs. Check the documentation about the API here: https://developers.brevo.com/

Why? (Context)

Due to an un-maintained SDK, we should move from the official SDK' to working directly with the provider's API spec.

Definition of Done

• the SDK package has been removed from the package.json file
• the current provider functionality works with the calls to their APIs using Axios
  • attachments
  • email delivery with all fields

[Vidip-Ghosh]

Which tech will be used in this case?

[nick2432]

can i work on this?

[Dhoni77]

I would like to work on this

[ayushshukla7777]

hey, I'm free too. Can I work on this or any of the new tasks?

[djabarovgeorge]

Thanks to everyone for taking the initiative to help 🙏, I will assign @Dhoni77 for now as no one was assigned yet and he raised a PR already.