feat: implement workflow management

[mikeee]

[WIP]
Implements Workflow management (Alpha + Beta endpoints).

E2E testing is not yet implemented as Authoring is still outstanding.

This does not yet fully close this issue: #379 as authoring is not included in this PR.
Contributes towards the completion of dapr/dapr#7156

• Testing implemented
• Checks/Tests passing
• Documentation updated/improved

[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (ae8becf) 68.96% compared to head (d9b7adc) 72.22%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
client/workflow.go	96.02%	8 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #476      +/-   ##
==========================================
+ Coverage   68.96%   72.22%   +3.25%     
==========================================
  Files          34       36       +2     
  Lines        2707     3143     +436     
==========================================
+ Hits         1867     2270     +403     
- Misses        732      754      +22     
- Partials      108      119      +11     

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[yaron2]

cc @cgillum

[yaron2]

Thanks for picking up the review here @RyanLettieri

[RyanLettieri]

One test case I would like to see is passing in an input to the start workflow calls. In other SDKs we've run into an issue where certain input types would lead to an error since they couldn't be parsed correctly. For example, in .NET we needed to serialize the data and convert it into a bytestring. It may not be an issue in GO, but having the test coverage can't hurt.

[mikeee]

Merging these commits into #487