Push adapters are provided by external packages

[flovilmart]

No description provided.

[codecov-io]

Current coverage is 93.06%

Merging #1195 into master will increase coverage by +0.45% as of cf968a9

@@            master   #1195   diff @@
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  Files           89      84     -5
  Stmts         5621    5293   -328
  Branches      1014     965    -49
  Methods          0       0       
======================================
- Hit           5206    4926   -280
+ Partial         11      10     -1
+ Missed         404     357    -47

Review entire Coverage Diff as of cf968a9

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@flovilmart updated the pull request.

[nlutsenko]

Looks good.
Do you think we should create a common interface for the push adapter? Not sure if we have one already. Also, looking forward to see one signal push adapter decoupled...

[flovilmart]

I'm removing OneSignal right now, adding the tests, coverage etc... We have a common interface in PushAdapter.js, but we may wanna move them to https://github.com/parse-server-modules/parse-server-conformance-tests