db: InstantRow and instantRows

It is drop-in replacement for Row and fastRows, however instantRows returns a
handle, not seq[string], so no Nim string is created until [] operator is
called on the given handle. Also there is a len() proc returning number of
columns in the handle.

In some situations, when we iterate through many rows, but later we just read
few columns this solution will be quicker than converting all column to Nim
seq[string] on each iteration.

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