Add .exclude and .extract helpers

[mmkal]

Closes #219

@reiv do you think this would help with the use case you described?

[codecov-io]

Codecov Report

Merging #220 (5951c57) into main (11e6d41) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #220   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
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  Files           40        40           
  Lines          710       710           
  Branches       116       116           
=========================================
  Hits           710       710           

Impacted Files	Coverage Δ
packages/expect-type/src/index.ts	100.00% <ø> (ø)

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[reiv]

@mmkal yep, that would mean I wouldn't have to extract the object-like member into a separate type to test it. My use case would be closer to this (I edited my reply in the linked issue to reflect this as well):

expectTypeOf<ResponsiveProp<number>>().excluding<number | number[]>().toHaveProperty("sm");
expectTypeOf<ResponsiveProp<number>>().excluding<number | number[]>().not.toHaveProperty("xxl");

i.e. validating its usage as an input type.