FileContainer: add path and meta properties

[mathause]

• towards make FileContainer iteration more dict-like #108

Once again I am not sure about the names. Should it be paths and meta or path and meta, or paths and metas? Or ...?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.67%. Comparing base (ddeadd1) to head (53bb3ea).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #121   +/-   ##
=======================================
  Coverage   99.66%   99.67%           
=======================================
  Files           5        5           
  Lines         303      310    +7     
=======================================
+ Hits          302      309    +7     
  Misses          1        1           

Flag	Coverage Δ
unittests	99.67% <100.00%> (+<0.01%)	⬆️

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[mathause]

@veni-vidi-vici-dormivi once again I call on your naming expertise 😉

[veni-vidi-vici-dormivi]

My intuition is paths and meta.

[mathause]

thanks 🤗