[feat] seek video and update frame

[chrisgervang]

Seeking enables the user to control the preview time cursor.

In Worldview:

• dispatch a seekTime action
• dispatch updateFrame when seeking to new time, and the store result.

In core:

• call seek function on DeckAdapter

A future PR will add a react component that uses this seek function.

[coveralls]

Pull Request Test Coverage Report for Build 920008159

• 0 of 0 changed or added relevant lines in 0 files 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 919928089:	0.0%
Covered Lines:	2
Relevant Lines:	2

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💛 - Coveralls