Brevo: Rename SendinBlue to Brevo

- Replace "SendinBlue" with "Brevo"
  throughout the code.
- Maintain deprecated compatibility
  versions on the old names/URLs.
  (Split into separate commit
  to make renamed files more
  obvious.)
- Update docs to reflect change,
  provide migration advice.
- Update integration workflow.

anymail/urls.py

@@ -4,6 +4,7 @@ from .webhooks.amazon_ses import (
     AmazonSESInboundWebhookView,
     AmazonSESTrackingWebhookView,
 )
+from .webhooks.brevo import BrevoInboundWebhookView, BrevoTrackingWebhookView
 from .webhooks.mailersend import (
     MailerSendInboundWebhookView,
     MailerSendTrackingWebhookView,
@@ -15,10 +16,6 @@ from .webhooks.postal import PostalInboundWebhookView, PostalTrackingWebhookView
 from .webhooks.postmark import PostmarkInboundWebhookView, PostmarkTrackingWebhookView
 from .webhooks.resend import ResendTrackingWebhookView
 from .webhooks.sendgrid import SendGridInboundWebhookView, SendGridTrackingWebhookView
-from .webhooks.sendinblue import (
-    SendinBlueInboundWebhookView,
-    SendinBlueTrackingWebhookView,
-)
 from .webhooks.sparkpost import (
     SparkPostInboundWebhookView,
     SparkPostTrackingWebhookView,
@@ -32,6 +29,11 @@ urlpatterns = [
         AmazonSESInboundWebhookView.as_view(),
         name="amazon_ses_inbound_webhook",
     ),
+    path(
+        "brevo/inbound/",
+        BrevoInboundWebhookView.as_view(),
+        name="brevo_inbound_webhook",
+    ),
     path(
         "mailersend/inbound/",
         MailerSendInboundWebhookView.as_view(),
@@ -66,11 +68,6 @@ urlpatterns = [
         SendGridInboundWebhookView.as_view(),
         name="sendgrid_inbound_webhook",
     ),
-    path(
-        "sendinblue/inbound/",
-        SendinBlueInboundWebhookView.as_view(),
-        name="sendinblue_inbound_webhook",
-    ),
     path(
         "sparkpost/inbound/",
         SparkPostInboundWebhookView.as_view(),
@@ -81,6 +78,11 @@ urlpatterns = [
         AmazonSESTrackingWebhookView.as_view(),
         name="amazon_ses_tracking_webhook",
     ),
+    path(
+        "brevo/tracking/",
+        BrevoTrackingWebhookView.as_view(),
+        name="brevo_tracking_webhook",
+    ),
     path(
         "mailersend/tracking/",
         MailerSendTrackingWebhookView.as_view(),
@@ -116,11 +118,6 @@ urlpatterns = [
         SendGridTrackingWebhookView.as_view(),
         name="sendgrid_tracking_webhook",
     ),
-    path(
-        "sendinblue/tracking/",
-        SendinBlueTrackingWebhookView.as_view(),
-        name="sendinblue_tracking_webhook",
-    ),
     path(
         "sparkpost/tracking/",
         SparkPostTrackingWebhookView.as_view(),