feat(hashets): add WrapPrecomputedFS

[UiP9AV6Y]

filesystem implementation usable for scenarios where consumers request resources with their hashed name.

[UiP9AV6Y]

the example project in this MR depends on #2 as it calls hashets with -code-only

i can also create a dedicated MR for the example project in order to keep the focus of this MR on the implementation of HashFS

[mavolin]

I really appreciate the time you took writing the example. Therefore I feel bad for saying this, but I feel the example is just too big (9 files) to be sensible. I realise there are people who prefer thorough examples, but I think if you were to add this method of hashing to the readme and quickly explain the tradeoffs/benefits compared to the other methods (mimicking the style of the other examples), it would prove just as valueable.

I think this has two advantages:

1. Since there are no examples for the other methods of hashing, people might overlook this example.
2. The examples in the readme are much shorter and can hence be understood in far less time. I've had the experience that mini-project examples like this take far more time to understand, since there is no "guiding hand" that explains the idea; whereas the readme can sort of "narrate" what is happening, often requiring less code and therefore less effort to understand the idea behind this example.

I'm obviously fine HashFS itself.

[UiP9AV6Y]

i have remove the example app and instead added an additional section to the README.md explaining the usecase and drawbacks

[mavolin]

Good renaming, thank you for readme section. Some minor changes for clarity, and then we have it. :)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.64%. Comparing base (ed6b867) to head (ab4c46f).
⚠️ Report is 10 commits behind head on v1.

Additional details and impacted files

@@             Coverage Diff             @@
##               v1       #3       +/-   ##
===========================================
+ Coverage   27.58%   57.64%   +30.06%     
===========================================
  Files           5        3        -2     
  Lines         348      170      -178     
===========================================
+ Hits           96       98        +2     
+ Misses        231       51      -180     
  Partials       21       21               

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[mavolin]

@UiP9AV6Y thank you for your PRs, I've created a release :)