Close inactive contexts

[elacuesta]

Requested in #20

Introduce a new PLAYWRIGHT_CLOSE_CONTEXT_INTERVAL: int setting. Contexts that have spent the specified amount of seconds without pages will be automatically closed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.82%. Comparing base (848955e) to head (891c95b).

❗ There is a different number of reports uploaded between BASE (848955e) and HEAD (891c95b). Click for more details.

HEAD has 6 uploads less than BASE

Flag	BASE (848955e)	HEAD (891c95b)
	12	6

Additional details and impacted files

@@             Coverage Diff             @@
##              main     #206      +/-   ##
===========================================
- Coverage   100.00%   93.82%   -6.18%     
===========================================
  Files            6        6              
  Lines          595      615      +20     
===========================================
- Hits           595      577      -18     
- Misses           0       38      +38     

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