community[patch]: add Integration for OpenAI image gen with v1 sdk (#17771)

**Description:** Created a Langchain Tool for OpenAI DALLE Image
Generation.
**Issue:**
[#15901](https://github.com/langchain-ai/langchain/issues/15901)
**Dependencies:** n/a
**Twitter handle:** @paulodoestech

- [x] **Add tests and docs**: If you're adding a new integration, please
include
1. a test for the integration, preferably unit tests that do not rely on
network access,
2. an example notebook showing its use. It lives in
`docs/docs/integrations` directory.


- [x] **Lint and test**: Run `make format`, `make lint` and `make test`
from the root of the package(s) you've modified. See contribution
guidelines for more: https://python.langchain.com/docs/contributing/

Additional guidelines:
- Make sure optional dependencies are imported within a function.
- Please do not add dependencies to pyproject.toml files (even optional
ones) unless they are required for unit tests.
- Most PRs should not touch more than one package.
- Changes should be backwards compatible.
- If you are adding something to community, do not re-import it in
langchain.

If no one reviews your PR within a few days, please @-mention one of
baskaryan, efriis, eyurtsev, hwchase17.

---------

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

libs/community/tests/unit_tests/tools/openai_dalle_image_generation/test_image_generation.py

@@ -0,0 +1,15 @@
+from unittest.mock import MagicMock
+
+from langchain_community.tools.openai_dalle_image_generation import (
+    OpenAIDALLEImageGenerationTool,
+)
+
+
+def test_generate_image() -> None:
+    """Test OpenAI DALLE Image Generation."""
+    mock_api_resource = MagicMock()
+    # bypass pydantic validation as openai is not a package dependency
+    tool = OpenAIDALLEImageGenerationTool.construct(api_wrapper=mock_api_resource)
+    tool_input = {"query": "parrot on a branch"}
+    result = tool.run(tool_input)
+    assert result.startswith("https://")