Meetings API Support

[SecondeJK]

This PR adds support for the Meetings API

Description

New client with all relevant methods documented

Motivation and Context

Evolution of Vonage APIs

How Has This Been Tested?

Full test suite included

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.

[Tr00d]

Given I'll be traveling from tomorrow, I'm going to preapproved the PR to make sure you don't get blocked in the following days

[codecov-commenter]

Codecov Report

Merging #417 (bbf57c2) into main (8e9f239) will increase coverage by 0.51%. The diff coverage is 87.78%.

@@             Coverage Diff              @@
##               main     #417      +/-   ##
============================================
+ Coverage     77.97%   78.48%   +0.51%     
- Complexity     2116     2183      +67     
============================================
  Files           200      209       +9     
  Lines          5634     5894     +260     
============================================
+ Hits           4393     4626     +233     
- Misses         1241     1268      +27     

Impacted Files	Coverage Δ
src/Client/Exception/Request.php	0.00% <ø> (ø)
src/Client/Exception/ThrottleException.php	100.00% <ø> (ø)
src/Client/Exception/Validation.php	100.00% <ø> (ø)
src/Meetings/ClientFactory.php	0.00% <0.00%> (ø)
src/Entity/IterableAPICollection.php	71.73% <33.33%> (-1.37%)	:arrow_down:
src/Meetings/DialInNumber.php	33.33% <33.33%> (ø)
src/Meetings/Application.php	66.66% <66.66%> (ø)
src/Meetings/ApplicationTheme.php	66.66% <66.66%> (ø)
src/Meetings/Recording.php	66.66% <66.66%> (ø)
src/Meetings/Room.php	66.66% <66.66%> (ø)
... and 4 more

... and 1 file with indirect coverage changes

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