Introduce Appfs telemetry

[SiskaPavel]

No description provided.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 42.76316% with 87 lines in your changes missing coverage. Please review.

Project coverage is 41.12%. Comparing base (f616af2) to head (d44905d).
Report is 18 commits behind head on master.

Files	Patch %	Lines
storage/cache.cpp	46.66%	26 Missing and 6 partials ⚠️
ipfixprobe.cpp	40.62%	17 Missing and 2 partials ⚠️
storage/fragmentationCache/fragmentationCache.cpp	22.22%	14 Missing ⚠️
input/input.cpp	47.82%	12 Missing ⚠️
input/parser.cpp	0.00%	3 Missing ⚠️
ipfixprobe.hpp	40.00%	3 Missing ⚠️
include/ipfixprobe/telemetry-utils.hpp	60.00%	1 Missing and 1 partial ⚠️
include/ipfixprobe/storage.hpp	0.00%	1 Missing ⚠️
input/raw.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #212      +/-   ##
==========================================
+ Coverage   40.89%   41.12%   +0.22%     
==========================================
  Files         102      104       +2     
  Lines        9659     9846     +187     
  Branches     1425     1438      +13     
==========================================
+ Hits         3950     4049      +99     
- Misses       4867     4944      +77     
- Partials      842      853      +11     

Flag	Coverage Δ
tests	41.12% <42.76%> (+0.22%)	⬆️

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[cejkato2]

There is no change of README / doc even though this PR adds new features.

[cejkato2]

I'm happy for at least a short entry in the readme.
However, Pavel, if you were not a developer but some user, would you be able to read enough information from this?

What would you expect to find in doc?

I expected to find example of the mounted vfs, description of files, variables and values I can find there.
I understand it is possible to just start it and look at it (and hopefully understand everything at once), but a good documentation should be much more helpful.