Change TOKEN_MAX_AGE to accept timedelta and default to 15 minutes.

[jwag956]

The config variable still accepts seconds (int) as well. This also (finally?) sets the default to something short - rather than 'never expire' - which out of the box is really bad.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.63%. Comparing base (3a24949) to head (b4402b5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1233   +/-   ##
=======================================
  Coverage   98.63%   98.63%           
=======================================
  Files          43       43           
  Lines        5358     5360    +2     
=======================================
+ Hits         5285     5287    +2     
  Misses         73       73           

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