fix(UI): Updated ui.py. Frees up the CPU to not be bottlenecked.

Updated ui.py to include a small sleep timer while building the stream deltas.  This recursive function fires off so quickly to eats up too much of the CPU.  This small sleep frees up the CPU to not be bottlenecked.  This value can go lower/shorter.  But 0.02 or 0.025 seems to work well. (#1589)

Co-authored-by: root <root@wesgitlabdemo.icl.gtri.org>

private_gpt/ui/ui.py

@@ -1,6 +1,7 @@
 """This file should be imported only and only if you want to run the UI locally."""
 import itertools
 import logging
+import time
 from collections.abc import Iterable
 from pathlib import Path
 from typing import Any
@@ -87,6 +88,7 @@ class PrivateGptUi:
                 elif isinstance(delta, ChatResponse):
                     full_response += delta.delta or ""
                 yield full_response
+                time.sleep(0.02)
 
             if completion_gen.sources:
                 full_response += SOURCES_SEPARATOR