Add `uid` attribute to `imap_content` event data (#114432)

* Add uid to imap event

* Add ´uid´ to tests

* Update test_init.py

homeassistant/components/imap/coordinator.py

@@ -264,6 +264,7 @@ class ImapDataUpdateCoordinator(DataUpdateCoordinator[int | None]):
                 "sender": message.sender,
                 "subject": message.subject,
                 "headers": message.headers,
+                "uid": last_message_uid,
             }
             if self.custom_event_template is not None:
                 try:

tests/components/imap/test_init.py

@@ -164,6 +164,7 @@ async def test_receiving_message_successfully(
     assert data["folder"] == "INBOX"
     assert data["sender"] == "john.doe@example.com"
     assert data["subject"] == "Test subject"
+    assert data["uid"] == "1"
     assert "Test body" in data["text"]
     assert (
         valid_date
@@ -213,6 +214,7 @@ async def test_receiving_message_with_invalid_encoding(
     assert data["sender"] == "john.doe@example.com"
     assert data["subject"] == "Test subject"
     assert data["text"] == TEST_BADLY_ENCODED_CONTENT
+    assert data["uid"] == "1"
 
 
 @pytest.mark.parametrize("imap_search", [TEST_SEARCH_RESPONSE])
@@ -251,6 +253,7 @@ async def test_receiving_message_no_subject_to_from(
     assert data["text"] == "Test body\r\n"
     assert data["headers"]["Return-Path"] == ("<john.doe@example.com>",)
     assert data["headers"]["Delivered-To"] == ("notify@example.com",)
+    assert data["uid"] == "1"
 
 
 @pytest.mark.parametrize("imap_has_capability", [True, False], ids=["push", "poll"])