Include Titles in FileItems

[bame-da]

This fixes an issue where sphinx-autoupdate does not pick up changes to titles in the _toc.yaml file.

To reproduce, use the example project,

1. build using sphinx-autobuild --port 8001 . _build/
2. add a title attributes to one of the files, eg api.md
3. change the title int he title attribute

You'll see that the change does not get picked up. The reason is that line 251 of api.py does an equality check on the items in the sitemap: prev_doc = previous[name].
Since the title is included in the Document class, the changes in 2. and 3. above trigger a rebuild of the api.md. But the ToC is injected into the intro.md file, which is unchanged both as a file and from the point of view of the get_changed function.

By including the titles on FileItems, such changes get picked up by get_changed and the ToC updates correctly.

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[codecov]

Codecov Report

Base: 91.06% // Head: 91.14% // Increases project coverage by +0.07% 🎉

Coverage data is based on head (176d6d4) compared to base (4e83bb6).
Patch coverage: 92.30% of modified lines in pull request are covered.

❗ Current head 176d6d4 differs from pull request most recent head 8a33082. Consider uploading reports for the commit 8a33082 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #88      +/-   ##
==========================================
+ Coverage   91.06%   91.14%   +0.07%     
==========================================
  Files           7        7              
  Lines         739      745       +6     
==========================================
+ Hits          673      679       +6     
  Misses         66       66              

Flag	Coverage Δ
pytests	91.14% <92.30%> (+0.07%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sphinx_external_toc/parsing.py	92.17% <75.00%> (+0.04%)	⬆️
sphinx_external_toc/api.py	94.33% <100.00%> (+0.28%)	⬆️
sphinx_external_toc/events.py	90.41% <100.00%> (-0.06%)	⬇️
sphinx_external_toc/tools.py	90.24% <100.00%> (+0.05%)	⬆️

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