Use IntOrString type for disk RPM representation

[Starttoaster]

For Starttoaster/proxmox-exporter#56

This pull request also fixes a bug where the library responsibly closes the response body, however, that should be up to the user of this library to do it if they capture the http Response object in a variable.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 47.51%. Comparing base (8689574) to head (a1c6cad).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
request.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
+ Coverage   43.85%   47.51%   +3.66%     
==========================================
  Files           5        5              
  Lines         187      181       -6     
==========================================
+ Hits           82       86       +4     
+ Misses         80       70      -10     
  Partials       25       25              

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