Implement sentry.io for javascript error logging for engage app

[alexbridge]

Description

Implement sentry.io for javascript error logging for engage app

Type of change

Please add an "x" into the option that is relevant:

• [ ] Bug Fix 🐛 (non-breaking change which fixes an issue)
• [ ] New Feature 🚀 (non-breaking change which adds functionality)
• [ ] Breaking Change 💥 (fix or feature that would cause existing functionality to not work as expected)
• [ ] Polish 💅 (Just some cleanups)
• [ ] Docs 📝 (Changes in the documentations)
• [ X ] Internal 🏠 Only relates to internal processes.

[coveralls]

Pull Request Test Coverage Report for Build 2085

• 3 of 56 (5.36%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.2%) to 47.13%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
libraries/common/components/ErrorBoundary/connector.js	1	2	50.0%
themes/theme-gmd/pages/subscribers.js	0	1	0.0%
themes/theme-ios11/pages/subscribers.js	0	1	0.0%
libraries/common/subscriptions/error.js	0	50	0.0%

Totals
Change from base Build 2084:	-0.2%
Covered Lines:	5064
Relevant Lines:	10081

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 2072

• 2 of 57 (3.51%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.2%) to 47.111%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
themes/theme-gmd/pages/subscribers.js	0	1	0.0%
themes/theme-ios11/pages/subscribers.js	0	1	0.0%
libraries/common/components/ErrorBoundary/connector.js	0	4	0.0%
libraries/common/subscriptions/error.js	0	49	0.0%

Totals
Change from base Build 2071:	-0.2%
Covered Lines:	5058
Relevant Lines:	10078

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💛 - Coveralls