Add benches w/ copy to geo geometry & encoding

[kylebarron]

• I agree to follow the project's code of conduct.
• I added an entry to CHANGES.md if knowledge of this change could be valuable to users.
• I ran cargo fmt

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Previously the bench to parse was

This is 2.3x faster than shapely.wkb.loads, and 11x faster than shapely.wkb.dumps! There's probably a tiny bit of Python overhead on the shapely side (e.g. an extra full-buffer copy back to Python after GEOS has serialized the geometry to a buffer) but I expect this is still at least a little faster than GEOS.

parse big to geo        time:   [161.29 µs 161.83 µs 162.38 µs]
                        change: [-1.0724% -0.4549% +0.1358%] (p = 0.15 > 0.05)

encode big              time:   [49.969 µs 50.204 µs 50.437 µs]

from shapely import wkt, wkb

with open('big.wkt') as f:
    geom = wkt.load(f)

%timeit buf = wkb.dumps(geom)
# 547 μs ± 3.2 μs per loop (mean ± std. dev. of 7 runs, 1,000 loops each)

%timeit test = wkb.loads(buf)
# 369 μs ± 1.01 μs per loop (mean ± std. dev. of 7 runs, 1,000 loops each)