Conversions utilities

[jorgepiloto]

This pull request solves for #45 by introducing the Pint as default units manager. By simply running:

from skaero import units as u

# Altitude conversion
alt = 10000.00 * u.foot
alt_meters = alt.to(u.meters)

This package does not introduce any other dependencies being a lightweight implementation.

[codecov-io]

Codecov Report

Merging #47 into master will increase coverage by 0.16%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #47      +/-   ##
==========================================
+ Coverage   72.61%   72.78%   +0.16%     
==========================================
  Files          10       10              
  Lines         325      327       +2     
==========================================
+ Hits          236      238       +2     
  Misses         89       89

Impacted Files	Coverage Δ
src/skaero/__init__.py	100% <100%> (ø)	⬆️

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