chore: Move Apps-Engine to monorepo

[d-gubert]

Proposed changes (including videos or screenshots)

Move the Apps-Engine repo (https://github.com/RocketChat/Rocket.Chat.Apps-Engine) to the core monorepo (https://github.com/RocketChat/Rocket.Chat)

This will allow for a much smoother developer experience when adding features to the engine, as it won't be necessary anymore to wait for merges on one repo to then get other PR merged, and also we won't have conflicts anymore if something is merged on the engine side but not on the core side.

Benefits

• Smoother DX - there won't be a need to keep and conciliate PRs in two repos when making changes
• Slimmer package - there won't be a need for the published package to contain internal logic, we'll be able to simply publish types. The same goes for its dependencies, as Deno, for instance, won't be required by the package when it is installed for app development.
• Better control - we'll be able to close internal pieces of the engine as "Enterprise Edition" and keep public parts open much more easily
• Core types interop - Rocket.Chat types will be more accessible to the package.

Drawbacks

• Increased monorepo operations - CI/CD cycles will potentially get slower given that more things will need to be installed and built
• Apps-Engine release process tightly closed to the Rocket.Chat one - this will prevent the Apps-Engine package from having a release (e.g. a patch) outside of Rocket.Chat's release cycle automatically. However, this situation has been rare in the past and it can be worked around manually if needed.
• Github workflows take a long time to run on the monorepo - well... yeah.

Considerations

• What to do with issues and PRs on the Apps-Engine repo?

• What do we do with the API reference? Currently it is hosted in github.io. Can we just port it?

• What do we need to adapt here for Codecov?

Issue(s)

Steps to test or reproduce

Further comments

https://rocketchat.atlassian.net/browse/CONN-308

As of now, the apps-engine cannot execute deno without a global installation in the system (e.g. the binary being available /bin/deno). This seemed to start after Meteor's update to their own Node patch 14.21.4

This was because we were overriding the ENV for the process and weren't passing a PATH, which causes the system to be unable to find the deno executable. It never happened before because previously we were using the deno-bin package to install deno and so we knew the direct path to the executable and didn't need to rely on the PATH environment variable.

Note for reviewers

Most of the files introduced by this PR already exist and are part of the @rocket.chat/apps-engine package - meaning they don't need further review, as they're just being moved. The important files to keep an eye out for are the ones outside of the packages/apps-engine folder, the packages/apps-engine/package.json file itself and whatever scripts it references, as those integrate the new package into the rest of the monorepo ecosystem.

In order words, don't be frightened by the amount of files 🙈

[dionisio-bot]

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Latest commit: 2bb36d7

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.38%. Comparing base (214d1b3) to head (2bb36d7).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #32951      +/-   ##
===========================================
+ Coverage    58.35%   59.38%   +1.03%     
===========================================
  Files         2692     2556     -136     
  Lines        65265    63080    -2185     
  Branches     14730    14158     -572     
===========================================
- Hits         38084    37459     -625     
+ Misses       24403    22915    -1488     
+ Partials      2778     2706      -72     

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unit	75.32% <ø> (ø)

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