Use LazyRead instead of read_bytes

[blegat]

When reading andora.osm.pbf with OpenStreetMapX (using pszufe/OpenStreetMapX.jl#52), the timing is:
Before this PR:

julia> @time OpenStreetMapX.parsePBF("/home/blegat/Downloads/andorra-latest.osm.pbf");
  0.266550 seconds (578.92 k allocations: 134.372 MiB, 16.38% gc time)

After this PR:

julia> @time OpenStreetMapX.parsePBF("/home/blegat/Downloads/andorra-latest.osm.pbf");
  0.226363 seconds (439.89 k allocations: 111.927 MiB)

read_bytes makes a copy of the bytes, even nested ones if an object contains another object or a packed vector, ...
With this PR, we make instead a wrapper type that virtually limits the size of the IO.
As this can be called recursively, this could create a stack of LazyRead wrappers so we take care of avoiding this and just update the LazyRead instead.

[Drvi]

Closing as we overhauled the whole package. I invite you to try the new version out, it should be faster.