Improve memory and performance of url.Query #410
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1 - Use getOrPut to avoid making 2 map lookups where possible.
2 - Use an arena allocator for Values, which makes memory management simpler.
3 - Because of the arena, we no longer need to allocate key or values which don't need
to be unescaped. The downside is that the input string has to outlive the
query.Values (but I think this is currently always the case)
4 - Optimize unescape logic & allocations
5 - Improve test coverage