changing numbers API to use header authentication

[maxkahan]

The numbers api now uses header authentication instead of query parameter authentication.

Have added a type hint to the response to allow for easier debugging

Blackened the file

[codecov-commenter]

Codecov Report

Merging #255 (049f087) into main (d338f37) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #255   +/-   ##
=======================================
  Coverage   97.25%   97.25%           
=======================================
  Files          20       20           
  Lines         728      729    +1     
=======================================
+ Hits          708      709    +1     
  Misses         20       20           

Impacted Files	Coverage Δ
src/vonage/client.py	96.29% <100.00%> (+0.01%)	:arrow_up:
src/vonage/number_management.py	100.00% <100.00%> (ø)

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