[Reputation Oracle] Email service refactoring

[Dzeranov]

Issue tracking

Part of the #3084

Context behind the change

Introducing EmailService which provides a common interface for sending emails.
Under the hood it uses SendgridEmailService which could be easily replaced in the future by any other email provider without affecting source code.
Tests rewritten from scratch, faker is being used for generating data.

How has this been tested?

• Unit tests for sendgrid.service.ts
• Changed unit tests in auth module
• Locally deployed and tested the affected code (should log in dev mode, send an email in stg/prod)

Release plan

Envs:

1. SENDGRID_FROM_EMAIL -> EMAIL_FROM
2. SENDGRID_FROM_NAME -> EMAIL_FROM_NAME

• Staging
• Production

Potential risks; What to monitor; Rollback plan

TBD

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[dnechay]

Nice