use inspect data for hash and file size

[fgregg]

inspect_data should already include the hash and the db file size, so this PR takes advantage of using those instead of always recalculating. should help a lot on startup with large DBs.

closes #1834

[simonw]

Wow, great catch! The whole point of inspect data was to avoid this kind of expensive operation on startup so this makes total sense - I had no idea Datasette was still trying to hash a giant file every time the server started.

[codecov]

Codecov Report

Base: 91.71% // Head: 92.50% // Increases project coverage by +0.78% 🎉

Coverage data is based on head (b4b92df) compared to base (cb1e093).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1835      +/-   ##
==========================================
+ Coverage   91.71%   92.50%   +0.78%     
==========================================
  Files          38       35       -3     
  Lines        4754     4400     -354     
==========================================
- Hits         4360     4070     -290     
+ Misses        394      330      -64     

Impacted Files	Coverage Δ
datasette/database.py
datasette/utils/shutil_backport.py
datasette/__init__.py
datasette/views/base.py	94.75% <0.00%> (+0.01%)	⬆️

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[simonw]

See also:

• Make hash and size a lazy property #1837