chore: Adapt to apify-client v3 [WIP]

[vdusek]

Description

• This PR updates the SDK to work with apify-python-client v3, which introduces fully typed API clients generated from OpenAPI specifications.
• See refactor!: Introduce fully typed clients [WIP] apify-client-python#554 for more details.

Issues

• Closes: Adapt to typed apify-client-python #736

Testing

• The existing SDK tests pass with apify-python-client v3.

[codecov]

Codecov Report

❌ Patch coverage is 87.17949% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.00%. Comparing base (2c8cfdb) to head (b7da67f).

Files with missing lines	Patch %	Lines
src/apify/_actor.py	64.51%	11 Missing ⚠️
src/apify/_charging.py	80.00%	1 Missing ⚠️
...ify/storage_clients/_apify/_api_client_creation.py	50.00%	1 Missing ⚠️
...rc/apify/storage_clients/_apify/_dataset_client.py	66.66%	1 Missing ⚠️
.../storage_clients/_apify/_key_value_store_client.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #719      +/-   ##
==========================================
+ Coverage   81.98%   82.00%   +0.01%     
==========================================
  Files          46       46              
  Lines        2681     2745      +64     
==========================================
+ Hits         2198     2251      +53     
- Misses        483      494      +11     

Flag	Coverage Δ
integration	56.21% <66.66%> (+0.07%)	⬆️
unit	67.83% <48.71%> (-0.10%)	⬇️

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