[chore] add some more slice related utility functions + remove duplicates #3149
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got bored so decided to add some more useful utility functions. i know we're already doing some of the functionality provided by these in areas of the codebase so in time they can probably be updated to use these.
the advantage of these functions being that they're optimized to minimize number of
append()
type calls which allocate new slice lengths when needed. these functions try to allocate as much up-front as possible.