move to Async Runtime (using Tokio)

[xpromache]

Fixes #6

[codecov-commenter]

Codecov Report

Patch coverage: 95.90% and project coverage change: +0.89 🎉

Comparison is base (d06516f) 95.63% compared to head (2d22ec8) 96.53%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #46      +/-   ##
==========================================
+ Coverage   95.63%   96.53%   +0.89%     
==========================================
  Files          17       17              
  Lines        7698     7503     -195     
==========================================
- Hits         7362     7243     -119     
+ Misses        336      260      -76     

Impacted Files	Coverage Δ
cfdp-core/src/transaction/error.rs	0.00% <ø> (ø)
cfdp-core/src/transport.rs	76.92% <82.35%> (+10.74%)	⬆️
cfdp-core/src/daemon.rs	73.01% <90.24%> (+0.91%)	⬆️
cfdp-core/src/transaction/send.rs	97.70% <95.18%> (+0.65%)	⬆️
cfdp-core/src/transaction/recv.rs	98.14% <100.00%> (+0.07%)	⬆️

... and 3 files with indirect coverage changes

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