Adds Dapr User Agent for Cosmos DB components

[berndverst]

Description

Adds Dapr User agent to Cosmos DB components per #1152

Issue reference

Closes #1152

Checklist

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

• Code compiles correctly

[berndverst]

Tests pass

go test -v -tags=conftests -count=1 ./tests/conformance -run="TestBindingsConformance/azure.cosmosdb"
go test -v -tags=conftests -count=1 ./tests/conformance -run="TestStateConformance/azure.cosmosdb"

[codecov]

Codecov Report

Merging #1232 (aa4f949) into master (3df47a5) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1232      +/-   ##
==========================================
- Coverage   35.12%   35.11%   -0.01%     
==========================================
  Files         147      147              
  Lines       12706    12708       +2     
==========================================
  Hits         4463     4463              
- Misses       7770     7772       +2     
  Partials      473      473              

Impacted Files	Coverage Δ
bindings/azure/cosmosdb/cosmosdb.go	21.17% <0.00%> (-0.26%)	⬇️
state/azure/cosmosdb/cosmosdb.go	15.26% <0.00%> (-0.07%)	⬇️

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