Feature/proactive connect

[SecondeJK]

Proactive Connect draft PR

Description

This PR adds Proactive Connect to the SDK

Motivation and Context

Evolution of Vonage API product offerings

How Has This Been Tested?

Full test suite added. No tests added for standard API response errors, as these are tested in other new SDKs AND in the ApiResource object

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.
• [x] 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 #402 (0c29619) into main (8e9f239) will increase coverage by 0.24%. The diff coverage is 82.12%.

@@             Coverage Diff              @@
##               main     #402      +/-   ##
============================================
+ Coverage     77.97%   78.21%   +0.24%     
- Complexity     2116     2183      +67     
============================================
  Files           200      205       +5     
  Lines          5634     5811     +177     
============================================
+ Hits           4393     4545     +152     
- Misses         1241     1266      +25     

Impacted Files	Coverage Δ
src/ProactiveConnect/ClientFactory.php	0.00% <0.00%> (ø)
src/Entity/IterableAPICollection.php	74.58% <41.66%> (+1.48%)	:arrow_up:
src/ProactiveConnect/Objects/ListItem.php	66.66% <66.66%> (ø)
src/ProactiveConnect/Objects/ManualList.php	86.11% <86.11%> (ø)
src/ProactiveConnect/Objects/SalesforceList.php	89.13% <89.13%> (ø)
src/ProactiveConnect/Client.php	93.93% <93.93%> (ø)

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