Add BytesMut::try_reserve()
#789
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This implements fallible allocations by adding the
BytesMut::try_reserve()API and implementing it on top ofVec::try_reserve. This uses a different implementation strategy to #613 (#521 originally), which I believe to be stronger and more closely follows the std approach of having two different code paths end-to-end: panicking and fallible.Fixes #484
Closes #613