feat(services/building/configuration): reduce the configuration params using an event

[homer0]

What does this PR do?

Disclaimer: This is a development feature.

This adds a reducer event to reduce the "params" object the plugin uses all across the services to create the configurations.

The idea is that plugins and implementations can make use of this event to modify the information without having to listen for the actual configuration reducers.

It also does a little refactor on the same file where the feature was added in order to escape the complexity rule :P.

How should it be tested manually?

Listen for the new event (and don't forget to return it at then of your listener) and, of course, run the tests:

yarn test
# or
npm test

[coveralls]

Pull Request Test Coverage Report for Build 151

• 20 of 20 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 149:	0.0%
Covered Lines:	1494
Relevant Lines:	1494

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💛 - Coveralls