Use bytes join fast path for large states payload

[bdraco]

Proposed change

b"".join has a fast path for when there are more than two bytes-strings to combine. This is cheaper than re-constructing the bytes-string for each concatenation. This make a difference when the payloads large. In this case they can be upwards of 1MiB+.

https://github.com/python/cpython/blob/f383ca1a6fa1a2a83c8c1a0e56cf997c77fa2893/Objects/stringlib/join.h#L123

Note: the above only applies to bytes object. f-strings are almost always a better choice when working with str objects. (but we use bytes here to avoid multiple encode/decode passes).

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