feat: inject store namespace

[tlambert03]

lets a store be associated with a namespace for type resolution

[codecov]

Codecov Report

Merging #7 (b4720b4) into main (b015267) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main        #7   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          303       319   +16     
=========================================
+ Hits           303       319   +16     

Impacted Files	Coverage Δ
src/in_n_out/_processors.py	100.00% <ø> (ø)
src/in_n_out/_providers.py	100.00% <ø> (ø)
src/in_n_out/_inject.py	100.00% <100.00%> (ø)
src/in_n_out/_store.py	100.00% <100.00%> (ø)

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