Performance middleware; improve trigger perf; add cart_full

[rgalanakis]

Improve trigger performance, add cart_full

• Add a cache to payment contexts that can store arbitrary data
  during the lifetime of the context. This allows us to call something
  like Trigger.gather (which uses datasets) multiple times,
  but only call the database once.
• Fix the issue where users could add too much to their cart
  which would be prohibited at checkout due to offering item limits.
  Instead, whenever we add a cart item, we return the full offering,
  (which contains the cart), rather than just the cart.
• This fix required making max_quantity_for take into account
  the items already in the cart.
• Add a new 'cart full' concept, to differentiate when a product
  has a zero quantity because it's out of stock (or unavailable
  because the user has already ordered too much),
  or whether it's zero quantity because they can't add any more of it
  because of what's in the current cart.

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Use dynamic translation on order history

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Add performance middleware

For each request, log out things like the total number of
sql queries and time spent in the database+driver.
At higher levels of logging,
also print out all the duplicate/similar queries.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.73%. Comparing base (c11b3f3) to head (55f4ba7).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #740      +/-   ##
==========================================
+ Coverage   98.72%   98.73%   +0.01%     
==========================================
  Files         466      468       +2     
  Lines       21163    21340     +177     
==========================================
+ Hits        20893    21071     +178     
+ Misses        270      269       -1     

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