Add slides for stage 7

Author: siddhantwahal

slides/07_background_processing.md

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+<!-- #region slideshow={"slide_type": "slide"} -->
+## Sharing scientific tools: script to desktop application
+
+### Background processing with Traits Futures
+
+**Jonathan Rocher, Siddhant Wahal, Jason Chambless, Corran Webster, Prabhu Ramachandran**
+
+**SciPy 2022**
+
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+<!-- #region slideshow={"slide_type": "slide"} -->
+## Traits Futures:
+
+- Common problems with GUI frameworks:
+    - GUIs are unresponsive during heavy computation
+    - GUI toolkits generally require that widgets are only updated from the
+      thread from which they were created
+- Traits Futures solves both these problems:
+    - keeping the UI responsive
+    - safely update the UI in response to calculation results
+- Dispatching a background task returns a `future` object which provides:
+    - information about job status (e.g., job partially finished, completed,
+      failed)
+    - access to the job result
+- Incoming results arrive as trait changes on the main thread, ensuring thread
+  safety
+- Supports simple callbacks, iterations, and progress-reporting functions
+- Supports thread pools (default) and process pools
+
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+<!-- #region slideshow={"slide_type": "slide"} -->
+## Traits Futures
+- Let's dive in with an example
+- Installation:
+    - `edm install -e ets_tutorial traits_futures`
+    - Conda/pip: Activate virtual environment and `pip install traits_futures`
+
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