Decaff driver part 0

[sainthkh]

• Part of Proposal: Convert codebase CoffeeScript => JS => TypeScript #2690

Preparation for breaking down #5762. This time, I'll decaff the entire driver package. As it's a big project, I'll break it down to a few steps to make it easier to review.

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[jennifer-shehane]

I could probably nitpick a few tiny things, but overall this is great. Functionally looks solid. Can't wait to get this in. Thanks @sainthkh 💯

[jennifer-shehane]

The implementation ends up being the same (seeing all the calls) in this case although not a one to one comparison of previous code.

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