implement StackStore and QueueStore

[Krastanov]

Ordered versions of the Store resource.

[codecov-commenter]

Codecov Report

Merging #98 (e62228b) into master (c8595c6) will increase coverage by 0.50%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #98      +/-   ##
==========================================
+ Coverage   98.17%   98.67%   +0.50%     
==========================================
  Files          10       11       +1     
  Lines         274      302      +28     
==========================================
+ Hits          269      298      +29     
+ Misses          5        4       -1     

Files Changed	Coverage Δ
src/ConcurrentSim.jl	100.00% <ø> (ø)
src/resources/ordered_stores.jl	100.00% <100.00%> (ø)
src/resources/stores.jl	97.72% <100.00%> (+2.48%)	⬆️

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[Krastanov]

@hdavid16 , this is not redundant, right? I tried to see how else to make Stores with well defined order of items, but it does not seem like there is a way to do that right now. The implementation here is pretty simple and fully tested, so hopefully there are no issues with it.

[hdavid16]

This looks great. Good addition.
My only comment is that the Store docstring should be updated: the items are not stored in a FILO stack.

[Krastanov]

good catch! Thank you! Fixed this and will merge a bit later today.