Additional utils

[albireox]

Adds several small utilities:

• Timer() (already existed, but mentioning for completeness): a context manager to determine the duration of the task executed between __enter__ and __exit__.
• get_temporary_file_path(): returns a valid temporary named path.
• run_in_executor(): simple wrapper around asyncio run_in_executor that allows to use thread or process pool executors and handles arguments and keyword arguments.
• cancel_task(): cancels a task, suppressing the CancelledError.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (98c2231) 92.9% compared to head (d7fb2f0) 93.1%.

Files	Patch %	Lines
src/sdsstools/utils.py	94.0%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main     #46     +/-   ##
=======================================
+ Coverage   92.9%   93.1%   +0.3%     
=======================================
  Files          5       6      +1     
  Lines        559     606     +47     
  Branches     126     135      +9     
=======================================
+ Hits         519     564     +45     
- Misses        18      19      +1     
- Partials      22      23      +1     

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