Introduce async via tokio

[CosminLazar]

Prerequisite for sending metrics via open telemetry

[codecov-commenter]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (de413a8) 91.48% compared to head (4fd3d23) 90.74%.

Files	Patch %	Lines
src/homeassistant/mod.rs	90.00%	3 Missing ⚠️
src/main.rs	0.00%	2 Missing ⚠️
src/lib.rs	92.85%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
- Coverage   91.48%   90.74%   -0.75%     
==========================================
  Files           6        6              
  Lines         517      497      -20     
==========================================
- Hits          473      451      -22     
- Misses         44       46       +2     

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