Documentation updates

[sk1p]

• Clarify LiveContext lifetime
• Add section on run_udf_iter

TODO

• Make the test code runnable (add setup)

Contributor Checklist:

• I have added or updated my entry in the creators.json file
• I have added a changelog entry for my contribution
• I have added/updated documentation for all user-facing changes
• I have added/updated test cases

Reviewer Checklist:

• /azp run libertem.libertem-live-data passed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.41%. Comparing base (ffef8f1) to head (79226f5).

❗ There is a different number of reports uploaded between BASE (ffef8f1) and HEAD (79226f5). Click for more details.

HEAD has 6 uploads less than BASE

Flag	BASE (ffef8f1)	HEAD (79226f5)
	21	15

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #137      +/-   ##
==========================================
- Coverage   77.04%   68.41%   -8.64%     
==========================================
  Files          32       32              
  Lines        2989     2989              
  Branches      493      493              
==========================================
- Hits         2303     2045     -258     
- Misses        553      800     +247     
- Partials      133      144      +11     

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[sk1p]

/azp run libertem.libertem-live-data

[sk1p]

/azp run libertem.libertem-live-data

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[sk1p]

/azp run libertem.libertem-live-data

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).