Revert "chore: move encrypted tokens to environment variables"
Revert "chore: move encrypted tokens to environment variables"

This reverts commit 75f570ae

dubrovkinmaxim/sendgrid-csharp,sendgrid/sendgrid-csharp,sendgrid/sendgrid-csharp,sendgrid/sendgrid-csharp,dubrovkinmaxim/sendgrid-csharp