AV-2082: Better CKAN UWSGI configuration

[bzar]

• Converted ckan-uwsgi.ini into a template rendered in CKAN init script
• Make process/thread count configurable using .env in docker and parameter store in cdk
• New uwsgi settings:
  • strict: Error on invalid configuration
  • max-worker-lifetime/worker-reload-mercy: periodically reload workers to avoid getting stuck
  • single-interpreter: we only run one app in uwsgi so we can use this as a small optimization
  • die-on-term: if uwsgi gets SIGTERM, actually stop instead of just reloading (can avoid issues where a container is stuck)
  • thunder-lock: more balanced connection accepting with threads

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5a8c75b) 23.43% compared to head (63757bf) 23.43%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2100   +/-   ##
=======================================
  Coverage   23.43%   23.43%           
=======================================
  Files          43       43           
  Lines        6038     6038           
  Branches       34       34           
=======================================
  Hits         1415     1415           
  Misses       4623     4623           

Flag	Coverage Δ
cdk	93.13% <ø> (ø)
ckan	17.99% <ø> (ø)

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Files	Coverage Δ
cdk/lib/ckan-stack.ts	91.16% <ø> (ø)

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