[IMPROVE][Omnichannel] Refactor Office Hours feature

[MarcosSpessatto]

Proposed changes

The old Office Hours feature was checking the state of the Office Hours(open/close) every minute(setInterval). Through this refactoring, we're going to improve the process, now we're scheduling the opening/closing process as crontab jobs, so the setInterval is gone.
Also, we replaced the old rocketchat_livechat_office_hour collection by a new data structure, the new collection is called rocketchat_livechat_business_hours.

Issue(s)

How to test or reproduce

Screenshots

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves a current function)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Hotfix (a major bugfix that has to be merged asap)
• Documentation Update (if none of the other choices apply)

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• I have added necessary documentation (if applicable)
• Any dependent changes have been merged and published in downstream modules

Changelog

• Improved the process of opening/closing Office Hours. Now the new Business Hours are scheduled as Crontab jobs
• Replaced the old rocketchat_livechat_office_hour collection to a new data structure called rocketchat_livechat_business_hours
• Renamed the old feature from Office Hours to Business Hours
• Migrated the old Office Hours configuration to the new data structure

Further comments

[renatobecker]

@MarcosSpessatto congrats, it's an amazing implementation.
Can you please fix the conflict? Then I'll review it over.

Thanks.