feat: VoIP backend for FreeSwitch

[pierre-lehnen-rc]

Proposed changes (including videos or screenshots)

This PR adds a new page on the admin settings where an admin can configure and enable access to a FreeSwitch instance.

It also adds a new option to the list of users in the admin control panel. This new option allows admins to assign free switch users (extensions) to the rocket.chat users, so that they may use the VoIP capability in TeamCollab.

Finally it also adds all the endpoints the webclient may need in order to get the required information to connect a rocket.chat user to VoIP calls.

Issue(s)

VOIP-19
VOIP-20
VOIP-21
VOIP-26
VOIP-32
VOIP-34
VOIP-35
VOIP-38
VOIP-75
VOIP-76
VOIP-77

Steps to test or reproduce

Further comments

New endpoints:

voip-freeswitch.extension.list
voip-freeswitch.extension.getDetails
voip-freeswitch.extension.assign
voip-freeswitch.extension.getRegistrationInfoByUserId

[dionisio-bot]

Looks like this PR is not ready to merge, because of the following issues:

• This PR is missing the 'stat: QA assured' label
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[codecov]

Codecov Report

Attention: Patch coverage is 12.12121% with 87 lines in your changes missing coverage. Please review.

Project coverage is 54.80%. Comparing base (1e42acc) to head (e282455).

❗ Current head e282455 differs from pull request most recent head 9950914

Please upload reports for the commit 9950914 to get more accurate results.

Additional details and impacted files

@@                           Coverage Diff                           @@
##           feat/voip-freeswitch-feature-branch   #32435      +/-   ##
=======================================================================
- Coverage                                54.88%   54.80%   -0.09%     
=======================================================================
  Files                                     2384     2387       +3     
  Lines                                    52601    52702     +101     
  Branches                                 10828    10853      +25     
=======================================================================
+ Hits                                     28872    28885      +13     
- Misses                                   21156    21243      +87     
- Partials                                  2573     2574       +1     

Flag	Coverage Δ
e2e	53.79% <ø> (+<0.01%)	⬆️
unit	72.31% <12.12%> (-0.56%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

[pierre-lehnen-rc]

Closed in favor of #33093 (moving this feature to the 6.13 release instead of 7.0)