ChatRoom and Append rights

[joepio]

TODO:

• It's working!
• Fix sorting
• Push method for Commits (closes Push method for commits #388)
• Append-only right
• Update data-browser assets, depends on ChatRoom atomic-data-browser#153
• Add e2e test for ChatRoom. Invite, open, chat, reply, websockets.
• Fix home resource. There's a problem when signing authentication for the / resource, where the client appends a slash.

PR Checklist:

• Link to related issue closes ChatRoom plugin #373 closes Send all Commits to the Commit Monitor #253 closes Notify Atomic-Server when Db initiates a Commit #380 closes Append right #403
• Add changelog entry linking to issue
• Added tests (if needed)
• (If new feature) added in description / readme

[codecov-commenter]

Codecov Report

Merging #381 (45c0a59) into master (3e82dbe) will increase coverage by 0.66%.
The diff coverage is 76.70%.

@@            Coverage Diff             @@
##           master     #381      +/-   ##
==========================================
+ Coverage   64.23%   64.90%   +0.66%     
==========================================
  Files          69       70       +1     
  Lines        6551     6673     +122     
==========================================
+ Hits         4208     4331     +123     
+ Misses       2343     2342       -1     

Impacted Files	Coverage Δ
lib/src/lib.rs	100.00% <ø> (ø)
lib/src/plugins/chatroom.rs	0.00% <0.00%> (ø)
lib/src/validate.rs	9.00% <0.00%> (ø)
server/src/commit_monitor.rs	20.54% <0.00%> (ø)
server/src/errors.rs	23.45% <ø> (-0.94%)	⬇️
server/src/handlers/commit.rs	0.00% <ø> (ø)
server/src/handlers/search.rs	30.20% <ø> (+0.20%)	⬆️
server/src/handlers/upload.rs	0.00% <0.00%> (ø)
server/src/handlers/web_sockets.rs	0.00% <0.00%> (ø)
server/src/serve.rs	0.00% <0.00%> (ø)
... and 19 more

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