community[minor]: Infobip tool integration (#16805)

**Description:** Adding Tool that wraps Infobip API for sending sms or
emails and email validation.
**Dependencies:** None,
**Twitter handle:** @hmilkovic

Implementation:
```
libs/community/langchain_community/utilities/infobip.py
```

Integration tests:
```
libs/community/tests/integration_tests/utilities/test_infobip.py
```

Example notebook:
```
docs/docs/integrations/tools/infobip.ipynb
```

---------

Co-authored-by: Bagatur <baskaryan@gmail.com>

libs/community/tests/integration_tests/utilities/test_infobip.py

@@ -0,0 +1,86 @@
+from typing import Dict
+
+import responses
+
+from langchain_community.utilities.infobip import InfobipAPIWrapper
+
+
+def test_send_sms() -> None:
+    infobip: InfobipAPIWrapper = InfobipAPIWrapper(
+        infobip_api_key="test",
+        infobip_base_url="https://api.infobip.com",
+    )
+
+    json_response: Dict = {
+        "messages": [
+            {
+                "messageId": "123",
+                "status": {
+                    "description": "Message sent to next instance",
+                    "groupId": 1,
+                    "groupName": "PENDING",
+                    "id": 26,
+                    "name": "PENDING_ACCEPTED",
+                },
+                "to": "41793026727",
+            }
+        ]
+    }
+
+    with responses.RequestsMock() as rsps:
+        rsps.add(
+            responses.POST,
+            "https://api.infobip.com/sms/2/text/advanced",
+            json=json_response,
+            status=200,
+        )
+
+        response: str = infobip.run(
+            body="test",
+            to="41793026727",
+            sender="41793026727",
+            channel="sms",
+        )
+        assert response == "123"
+
+
+def test_send_email() -> None:
+    infobip: InfobipAPIWrapper = InfobipAPIWrapper(
+        infobip_api_key="test",
+        infobip_base_url="https://api.infobip.com",
+    )
+
+    json_response: Dict = {
+        "bulkId": "123",
+        "messages": [
+            {
+                "to": "test@example.com",
+                "messageId": "123",
+                "status": {
+                    "groupId": 1,
+                    "groupName": "PENDING",
+                    "id": 26,
+                    "name": "PENDING_ACCEPTED",
+                    "description": "Message accepted, pending for delivery.",
+                },
+            }
+        ],
+    }
+
+    with responses.RequestsMock() as rsps:
+        rsps.add(
+            responses.POST,
+            "https://api.infobip.com/email/3/send",
+            json=json_response,
+            status=200,
+        )
+
+        response: str = infobip.run(
+            body="test",
+            to="test@example.com",
+            sender="test@example.com",
+            subject="test",
+            channel="email",
+        )
+
+        assert response == "123"