make workflow client struct public

[famarting]

Description

Make workflow client struct public, so it can be referenced and typed and passed as a variable in other applications.

Issue reference

Please reference the issue this PR will close: #[issue number]

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• [ ] Code compiles correctly
• [ ] Created/updated tests
• [ ] Extended the documentation

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.

Project coverage is 58.04%. Comparing base (27248ba) to head (4c7f25d). Report is 11 commits behind head on main.

Files	Patch %	Lines
workflow/client.go	84.61%	2 Missing :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #577   +/-   ##
=======================================
  Coverage   58.04%   58.04%           
=======================================
  Files          55       55           
  Lines        3568     3568           
=======================================
  Hits         2071     2071           
  Misses       1375     1375           
  Partials      122      122           

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[ryanwinter]

I was just trying to figure out why it wasnt public and then this PR popped up :)

[marcduiker]

@holopin-bot @famarting Thank you Fabian!

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