feat: add to_dict method to domain classes

[jooola]

This allows us to serialize the domain classes by first converting them to "dumb types". For example, to convert the objects to JSON.

import json

domain = BaseDomain.from_dict(domain_dict)
json.dumps(domain.to_dict())

[jooola]

I first intended to use this to help with the hetzner.hcloud ansible collection inventory caching implementation. But I choose to use another method.

This might still be useful for the users of the library, to be able to export the entire domain object to a dict.

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 92.86%. Comparing base (a798979) to head (5c64538).
Report is 28 commits behind head on main.

Files	Patch %	Lines
hcloud/core/domain.py	94.73%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #270   +/-   ##
=======================================
  Coverage   92.86%   92.86%           
=======================================
  Files          65       65           
  Lines        2872     2889   +17     
=======================================
+ Hits         2667     2683   +16     
- Misses        205      206    +1     

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[github-actions]

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