Workflow versioning

[acroca]

Adds support for workflow versioning, both using patches and version names.

This implementation is almost exactly as the one in the Go SDK, both internally as well as the user-facing changes.

Requires dapr/durabletask-python#40

[codecov]

Codecov Report

❌ Patch coverage is 10.25641% with 35 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.52%. Comparing base (bffb749) to head (dfacaa9).
⚠️ Report is 65 commits behind head on main.

Files with missing lines	Patch %	Lines
...ext-workflow/dapr/ext/workflow/workflow_runtime.py	6.06%	31 Missing ⚠️
...orkflow/dapr/ext/workflow/dapr_workflow_context.py	33.33%	2 Missing ⚠️
...r-ext-workflow/dapr/ext/workflow/workflow_state.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #893      +/-   ##
==========================================
- Coverage   86.63%   86.52%   -0.11%     
==========================================
  Files          84      103      +19     
  Lines        4473     6939    +2466     
==========================================
+ Hits         3875     6004    +2129     
- Misses        598      935     +337     

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[elena-kolevska]

LGTM. Thank you for the extra effort for a detailed example!