refactor: try conditionally applying no type check

[ss2165]

Addressing #277
Following a suggestion from python/cpython#106309

It seems to partly work, not sure what's limiting it. The red squiggles on most lines are gone, but not inside "angle" or on the type annotations

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.02%. Comparing base (92ec6d1) to head (c276785).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #773   +/-   ##
=======================================
  Coverage   93.02%   93.02%           
=======================================
  Files          71       71           
  Lines        8327     8327           
=======================================
  Hits         7746     7746           
  Misses        581      581           

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[acl-cqc]

I'm never quite sure how much type-checkers actually run the code, but can you do:

if TYPE_CHECKING:
  guppy = cast(_Guppy, no_type_check)
else:
  ....

I guess guppy = no_type_check raises problems at calls to the guppy-decorated functions