feat: added Livechat's new theming settings to Appearance page

[aleksandernsilva]

Proposed changes (including videos or screenshots)

Added Livechat's new theming settings to Appearance page (available for Premium workspaces)

Newly added settings are:

• Livechat widget position on the screen: Changes the widget position between left or right of the viewport
• Livechat background: Changes the message list background. Receives the same value as the CSS's background property.
• Hide system messages: Changes the visibility of system messages displayed on the widget.
• Hide "powered by Rocket.Chat": Changes the visibility of Rocket.Chat's watermark on the widget.

Issue(s)

PROSVC-33
PROSVC-78

Steps to test or reproduce

Further comments

[changeset-bot]

🦋 Changeset detected

Latest commit: 1af455f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 32 packages

Name	Type
@rocket.chat/meteor	Minor
@rocket.chat/rest-typings	Minor
@rocket.chat/core-services	Patch
@rocket.chat/ui-contexts	Major
@rocket.chat/account-service	Patch
@rocket.chat/authorization-service	Patch
@rocket.chat/ddp-streamer	Patch
@rocket.chat/stream-hub-service	Patch
@rocket.chat/api-client	Patch
@rocket.chat/ddp-client	Patch
@rocket.chat/omnichannel-services	Patch
@rocket.chat/presence	Patch
rocketchat-services	Patch
@rocket.chat/omnichannel-transcript	Patch
@rocket.chat/presence-service	Patch
@rocket.chat/queue-worker	Patch
@rocket.chat/fuselage-ui-kit	Major
@rocket.chat/gazzodown	Major
@rocket.chat/livechat	Patch
@rocket.chat/ui-avatar	Major
@rocket.chat/ui-client	Major
@rocket.chat/ui-video-conf	Major
@rocket.chat/uikit-playground	Patch
@rocket.chat/web-ui-registration	Major
@rocket.chat/core-typings	Minor
@rocket.chat/apps	Patch
@rocket.chat/cron	Patch
@rocket.chat/model-typings	Patch
@rocket.chat/license	Patch
@rocket.chat/pdf-worker	Patch
@rocket.chat/models	Patch
@rocket.chat/instance-status	Patch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.82%. Comparing base (95540f5) to head (1af455f).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #32043      +/-   ##
===========================================
+ Coverage    52.32%   54.82%   +2.49%     
===========================================
  Files         2177     2299     +122     
  Lines        48729    50739    +2010     
  Branches      9928    10361     +433     
===========================================
+ Hits         25497    27816    +2319     
+ Misses       20954    20436     -518     
- Partials      2278     2487     +209     

Flag	Coverage Δ
e2e	53.84% <ø> (+4.84%)	⬆️
e2e-api	40.16% <ø> (+0.03%)	⬆️
unit	75.81% <ø> (ø)

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