Add a Reorder() decorator

[muir]

Reorder allows a provider move to a different part of the injection chain. This is useful when part of an injection chain is prebuilt and part is comes from another source and it's useful to pull some of the extra providers can provide inputs to the prebuilt portion.

Also a bugfix: Shun() wasn't given the priority it needed. It now is.

[codecov-commenter]

Codecov Report

Merging #31 (b763f3d) into main (c8be771) will increase coverage by 2.29%.
The diff coverage is 96.62%.

@@            Coverage Diff             @@
##             main      #31      +/-   ##
==========================================
+ Coverage   79.71%   82.00%   +2.29%     
==========================================
  Files          15       17       +2     
  Lines        2401     2651     +250     
==========================================
+ Hits         1914     2174     +260     
+ Misses        323      313      -10     
  Partials      164      164              

Impacted Files	Coverage Δ
api.go	93.82% <ø> (ø)
include.go	92.47% <80.00%> (+0.16%)	⬆️
debug.go	89.43% <88.88%> (+5.19%)	⬆️
reorder.go	97.60% <97.60%> (ø)
bind.go	88.20% <100.00%> (+1.31%)	⬆️
characterize.go	83.68% <100.00%> (+0.20%)	⬆️
intheap.go	100.00% <100.00%> (ø)
nject.go	78.39% <100.00%> (+0.07%)	⬆️
type_codes.go	94.28% <100.00%> (+3.80%)	⬆️
match.go	90.56% <0.00%> (-3.78%)	⬇️
... and 3 more

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