Migrate the MVP into kotaemon (#108)

- Migrate the MVP into kotaemon.
- Preliminary include the pipeline within chatbot interface.
- Organize MVP as an application.

Todo:

- Add an info panel to view the planning of agents -> Fix streaming agents' output.

Resolve: #60
Resolve: #61 
Resolve: #62

tests/test_ingestor.py

@@ -0,0 +1,15 @@
+from pathlib import Path
+
+from kotaemon.indices.ingests import DocumentIngestor
+from kotaemon.indices.splitters import TokenSplitter
+
+
+def test_ingestor_include_src():
+    dirpath = Path(__file__).parent
+    ingestor = DocumentIngestor(
+        pdf_mode="normal",
+        text_splitter=TokenSplitter(chunk_size=50, chunk_overlap=10),
+    )
+    nodes = ingestor(dirpath / "resources" / "table.pdf")
+    assert type(nodes) is list
+    assert nodes[0].relationships