fix: Correct consistency with double [float] number type parsing

[cheeseandcereal]

Description

Fixes #456

This PR fixes 'double' number type parsing, by ensuring that all values documented/intended as 'doubles' in the transmission RPC are returned as 'float's by this library (as they're already currently correctly documented).

This fixes the issue of unintentionally returning 'int' types for these functions which document 'float' return types when the return value is a whole number (particularly 0 or 1). Some functions in the library already did this, but not all of them, so this PR fixes this inconsistency.

See the upstream transmission documentation for all parameters which are a 'double' value type which should be returned as 'float's by this library: /~https://github.com/transmission/transmission/blob/main/docs/rpc-spec.md

Testing

I ran all tests (task lint and task test [note, an __init__.py file needed to be added to the tests/ directory for task test to work]) as well as did a basic sanity check against live usage of this package after these changes.

Before these changes:

type(client.get_torrents()[0].percent_done)
<class 'int'>

After these changes:

type(client.get_torrents()[0].percent_done)
<class 'float'>

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 77.67%. Comparing base (57c064f) to head (8950f10).
Report is 40 commits behind head on master.

Files with missing lines	Patch %	Lines
transmission_rpc/torrent.py	0.00%	6 Missing ⚠️
transmission_rpc/client.py	0.00%	1 Missing ⚠️
transmission_rpc/session.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #457   +/-   ##
=======================================
  Coverage   77.67%   77.67%           
=======================================
  Files          14       14           
  Lines        1505     1505           
=======================================
  Hits         1169     1169           
  Misses        336      336           

Flag	Coverage Δ
3.10	77.67% <0.00%> (ø)
3.11	77.67% <0.00%> (ø)
3.12	77.67% <0.00%> (ø)
3.8	77.47% <0.00%> (ø)
3.9	77.47% <0.00%> (ø)

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