Add support for the conversation API

[mikeee]

Description

Adds support for the conversation API.

Currently imports github.com/dapr/dapr from master.
Overrides dapr with a commit reference from master. This will need to be reverted once a release is cut.

Issue reference

Please reference the issue this PR will close: #645

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]

Codecov Report

Attention: Patch coverage is 0% with 63 lines in your changes missing coverage. Please review.

Project coverage is 61.45%. Comparing base (6c59092) to head (d4f306e).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
client/conversation.go	0.00%	63 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #646      +/-   ##
==========================================
- Coverage   62.52%   61.45%   -1.07%     
==========================================
  Files          56       57       +1     
  Lines        4139     4268     +129     
==========================================
+ Hits         2588     2623      +35     
- Misses       1425     1517      +92     
- Partials      126      128       +2     

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