CB-13975: (android) Fix to fire pause event when cdvStartInBackground=true

[richturner]

Platforms affected

Android

What does this PR do?

When the app is started with cdvStartInBackground=true then a pendingPause event is cached until the messageChannel is initialised (before the pause event never reached the webview and it wasn't possible to determine in JS code that the app was started in the background), this change results in the following JS events inside the app:

• pause
• deviceready

As a user you can then store a flag (e.g. app.inBackground) and this can be checked in 'deviceready' handler.

What testing has been done on this change?

Only manually tested on several Android phones.

Checklist

• Reported an issue in the JIRA database
• Commit message follows the format: "CB-3232: (android) Fix bug with resolving file paths", where CB-xxxx is the JIRA ID & "android" is the platform affected.
• Added automated test coverage as appropriate for this change.

[codecov-io]

Codecov Report

Merging #435 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #435   +/-   ##
=======================================
  Coverage   43.95%   43.95%           
=======================================
  Files          17       17           
  Lines        1711     1711           
  Branches      318      318           
=======================================
  Hits          752      752           
  Misses        959      959

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[infil00p]

LGTM