feat: added manualimport endpoint

[marksie1988]

Description

Adds the endpoint for manualimport

Related issues

resolve #126

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• CI / Tests update
• Documentation update

How has this been tested

• I have added new tests where required
• I have run nox -s tests locally and passed
• I have tested this feature in a python script

[codecov]

Codecov Report

Merging #135 (c6e4a41) into master (4ee8845) will increase coverage by 0.66%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #135      +/-   ##
==========================================
+ Coverage   92.67%   93.33%   +0.66%     
==========================================
  Files          15       15              
  Lines         996     1035      +39     
==========================================
+ Hits          923      966      +43     
+ Misses         73       69       -4     

Impacted Files	Coverage Δ
pyarr/radarr.py	100.00% <100.00%> (ø)
pyarr/readarr.py	88.94% <100.00%> (+0.81%)	⬆️
pyarr/sonarr.py	97.04% <100.00%> (+0.24%)	⬆️

... and 1 file with indirect coverage changes

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