implement TrackedResource

[Krastanov]

No description provided.

[codecov-commenter]

Codecov Report

Merging #94 (efd437c) into master (bb72add) will increase coverage by 0.22%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #94      +/-   ##
==========================================
+ Coverage   98.20%   98.42%   +0.22%     
==========================================
  Files          10       11       +1     
  Lines         278      318      +40     
==========================================
+ Hits          273      313      +40     
  Misses          5        5              

Files Changed	Coverage Δ
src/ConcurrentSim.jl	100.00% <ø> (ø)
src/resources/tracked.jl	100.00% <100.00%> (ø)

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[Krastanov]

Fixes #80 -- at least as a rudimentary first step, but other future functionality would be nice to add as well.

@hdavid16 , I added a Tables.jl interface with the idea that the tables converter can take care of providing more detailed data in the future without causing breaking changes to the API.

E.g. we might start tracking exact occupancy by adding a column to the table. We can change the internal storage to make it more efficient without changing the tables interface.

Currently the idea is to keep the internal storage as simple as possible, but maybe add some postprocessing steps in the tables converter.

Let me know if you prefer any of this do be done differently. Let me know if you prefer a different name for the new resource wrapper.

[Krastanov]

This currently does not work great with interrupts or channels with latency. I will keep this on hold until I have something nice for those cases.