fix: enforce time limit on assemble as a whole, not just g2p

[joanise]

PR Goal?

I can still generate 503 with large text via the API, so this PR enforces the time limit on the whole of assemble, not just on g2p processing.

Feedback sought?

rubber stamping

Priority?

before ICLDC

Tests added?

yes

How to test?

requires messing with the API directly, giving it a very large payload.

Confidence?

high

Version change?

no

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
readalongs/text/convert_xml.py	61% smaller
readalongs/web_api.py	20% smaller
test/test_web_api.py	19% smaller

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.41%. Comparing base (7e2ccc9) to head (34c76da).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #262      +/-   ##
==========================================
+ Coverage   88.38%   88.41%   +0.03%     
==========================================
  Files          22       22              
  Lines        1859     1864       +5     
  Branches      336      338       +2     
==========================================
+ Hits         1643     1648       +5     
  Misses        179      179              
  Partials       37       37              

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