feat: proactive connect

[manchuck]

Adding in proactive connect

Description

Motivation and Context

Testing Details

Example Output or Screenshots (if appropriate)

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov-commenter]

Codecov Report

Merging #818 (82ad1a3) into 3.x (82399a4) will increase coverage by 0.06%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              3.x     #818      +/-   ##
==========================================
+ Coverage   78.94%   79.01%   +0.06%     
==========================================
  Files         104       89      -15     
  Lines        1211     1215       +4     
  Branches      234      239       +5     
==========================================
+ Hits          956      960       +4     
  Misses        255      255              

Impacted Files	Coverage Δ
packages/server-client/lib/transformers.ts	96.00% <ø> (ø)
packages/proactive-connect/lib/proactiveConnect.ts	100.00% <100.00%> (ø)
packages/server-client/lib/client.ts	98.41% <100.00%> (+0.02%)	:arrow_up:
packages/server-sdk/lib/vonage.ts	93.75% <100.00%> (ø)

... and 16 files with indirect coverage changes

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