SendGrid (SaaS source) (BatchSource/ MultiObject BatchSource/ BatchSink)

[dgrinenko]

Jira: https://issues.cask.co/browse/PLUGIN-77
Wiki: https://wiki.cask.co/display/CE/SendGrid

In scope of this PR:

• added source plugin

[dgrinenko]

@albertshau, @CuriousVini, @mikkin could you please review this PR?

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