Default bucket boundaries for explicit bucket histogram are different from specification

[jack-berg]

The java default explicit bucket histogram bucket boundaries are:

[5, 10, 25, 50, 75, 100, 250, 500, 750, 1_000, 2_500, 5_000, 7_500, 10_000]

But according to the spec should be:

[ 0, 5, 10, 25, 50, 75, 100, 250, 500, 1_000 ]

[jack-berg]

Reopening this since we reverted the fix in #4736.

Need to wait for a resolution on spec PR #2770.

[jack-berg]

The spec has changed the default boundaries to [ 0, 5, 10, 25, 50, 75, 100, 250, 500, 750, 1000, 2500, 5000, 7500, 10000 ].

Note that the only difference between the new defaults and our current defaults is that the spec has a 0 bucket. We should be able to add this bucket without issue because negative values currently aren't allowed so adding it should be functionally equivalent to what we currently do.