[BREAK] Move read-receipts to EE and threads check marks improvements

[matheusbsilva137]

Proposed changes (including videos or screenshots)

• Improvement: add read receipts for messages in threads only when the thread is open;
• Move read-receipts feature to EE (under the message-read-receipt module). The chat.getMessageReadReceipts endpoint and getReadReceipts Meteor method are now EE only.

Issue(s)

Steps to test or reproduce

Further comments

TC-73

[codecov]

Codecov Report

Merging #27074 (2418212) into develop (88f7024) will increase coverage by 1.18%.
The diff coverage is 75.00%.

❗ Current head 2418212 differs from pull request most recent head 5dc4c05. Consider uploading reports for the commit 5dc4c05 to get more accurate results

@@             Coverage Diff             @@
##           develop   #27074      +/-   ##
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+ Coverage    42.24%   43.43%   +1.18%     
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  Files          812      787      -25     
  Lines        16052    15560     -492     
  Branches      2072     1999      -73     
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- Hits          6781     6758      -23     
+ Misses        8991     8520     -471     
- Partials       280      282       +2     

Flag	Coverage Δ
e2e	43.43% <75.00%> (+1.18%)	⬆️

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

[outofrange]

Since I just stumbled over this, and haven't found any other info about Move read-receipts feature to EE - does this mean read notifications, those little check marks to the right of each message, a very useful feature, will be removed from the upcoming Community Edition?

Changes made

[ae5960e8-a6fc-491f-b252-898ecf59af95]

Please see this forum post regarding this change:
https://forums.rocket.chat/t/update-6-0-0-read-receipts-complaint/16164/4