add radial profile function

[mileslucas]

• add file for spatial profiles
• add radial profile code
• add examples and docstring
• add test for radial profie
• add radial_profile to docs

[codecov]

Codecov Report

Merging #43 (03616b6) into main (978f2f0) will increase coverage by 0.28%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
+ Coverage   89.47%   89.75%   +0.28%     
==========================================
  Files           9       10       +1     
  Lines         323      332       +9     
==========================================
+ Hits          289      298       +9     
  Misses         34       34              

Flag	Coverage Δ
unittests	89.75% <100.00%> (+0.28%)	⬆️

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Impacted Files	Coverage Δ
src/HCIToolbox.jl	100.00% <ø> (ø)
src/profiles.jl	100.00% <100.00%> (ø)

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