Add Condense() and SaveTo()

[muir]

SaveTo() added. Intermediate values can now be requested and written through pointers.

Collection.Condense() added -- a collection can now be turned into a single injector.
This can be done recursively. Combined with SaveTo, multiple copies of the same type
can be generated and preserved separately.

The Reflective type has been joined by new siblings: ReflectiveInvoker, ReflectiveArgs, and ReflectiveWrapper

[codecov-commenter]

Codecov Report

Merging #35 (e6c1927) into main (bf7d347) will increase coverage by 1.13%.
The diff coverage is 83.24%.

@@            Coverage Diff             @@
##             main      #35      +/-   ##
==========================================
+ Coverage   81.85%   82.98%   +1.13%     
==========================================
  Files          17       21       +4     
  Lines        2667     2862     +195     
==========================================
+ Hits         2183     2375     +192     
+ Misses        320      316       -4     
- Partials      164      171       +7     

Impacted Files	Coverage Δ
api.go	93.82% <ø> (ø)
filler_api.go	82.45% <ø> (ø)
reflective.go	69.38% <69.38%> (ø)
filler.go	67.28% <73.68%> (+4.75%)	⬆️
condense.go	76.27% <76.27%> (ø)
flows.go	82.90% <82.90%> (ø)
utils.go	84.61% <84.61%> (ø)
bind.go	86.72% <90.90%> (-1.49%)	⬇️
characterize.go	86.64% <100.00%> (+2.95%)	⬆️
generate.go	63.56% <100.00%> (+0.42%)	⬆️
... and 6 more

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