Feat/support sendgrid (#21011)

Co-authored-by: André de Matteo <andre.matteo@accenture.com>
Co-authored-by: crazywoola <100913391+crazywoola@users.noreply.github.com>

api/configs/feature/__init__.py

@@ -609,7 +609,7 @@ class MailConfig(BaseSettings):
     """
 
     MAIL_TYPE: Optional[str] = Field(
-        description="Email service provider type ('smtp' or 'resend'), default to None.",
+        description="Email service provider type ('smtp' or 'resend' or 'sendGrid), default to None.",
         default=None,
     )
 
@@ -663,6 +663,11 @@ class MailConfig(BaseSettings):
         default=50,
     )
 
+    SENDGRID_API_KEY: Optional[str] = Field(
+        description="API key for SendGrid service",
+        default=None,
+    )
+
 
 class RagEtlConfig(BaseSettings):
     """