[FIX] Added explicit server oembed provider for Twitter

[Cleod9]

Proposed changes

Use native oembed API for twitter in order to embed Tweets for direct links to Twitter posts

Issue(s)

#12924

How to test or reproduce

Paste a direct link to any tweet in any chat window in Rocket.Chat v3.3.3 and nothing happens. For example:
https://twitter.com/Pokemon/status/1273682732594475013

Screenshots

Instance without proposed fix:

Instance with the proposed fix:

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

Native Twitter oembed support for direct links to tweets

Further comments

Recommendedations for the future:

• Consider making oembed url patterns configurable in the Admin panel
• Determine feasibility of embedding images and video

Also note that I have been unsuccessful in getting a Meteor environment set up on my machine, but I was able to test through manual changes to the bundle within Docker. Would be helpful if someone else could run linting / unit tests