Implement the IRoomRead get messages function

[graywolf336]

What? :boat:

• Change the IterableIterator to AsyncIterableIterator.

Why? :thinking:

This way we can fetch the messages one at a time from the database instead of all the time.

Links :earth_americas:

This one replaces https://github.com/RocketChat/Rocket.Chat.Apps-engine/pull/162 and fixes #161

[codecov[bot]]

Codecov Report

Merging #268 into alpha will increase coverage by 1.94%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            alpha     #268      +/-   ##
==========================================
+ Coverage   53.05%   54.99%   +1.94%     
==========================================
  Files          74       82       +8     
  Lines        2754     2873     +119     
  Branches      408      408              
==========================================
+ Hits         1461     1580     +119     
  Misses       1293     1293              

Impacted Files	Coverage Δ
src/server/compiler/AppCompiler.ts	26.03% <ø> (ø)
src/server/accessors/RoomRead.ts	100.00% <100.00%> (ø)
src/server/accessors/ServerSettingRead.ts	100.00% <100.00%> (ø)
src/server/errors/index.ts	100.00% <0.00%> (ø)
src/server/storage/index.ts	100.00% <0.00%> (ø)
src/server/accessors/index.ts	100.00% <0.00%> (ø)
src/server/logging/index.ts	100.00% <0.00%> (ø)
src/server/bridges/index.ts	100.00% <0.00%> (ø)
src/server/managers/index.ts	100.00% <0.00%> (ø)
src/server/marketplace/license/index.ts	100.00% <0.00%> (ø)
... and 1 more

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