Relax witness size checking #103
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In this commit, we fix a bug that would cause nodes to be unable to parse a given block from the wire. The block would be properly accepted if fed in via other mechanisms. The issue here is that the old checks for the maximum witness size, circa segwit v0 where placed in the wire package _as well_ as the tx engine. This check should only be in the engine, since it's properly gated by other related scrip validation flags. The fix itself is simple: limit witnesses only based on the maximum block size in bytes, or ~4MB.
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this is a response to @nikooo777's inqury about CVE-2022-44797
and CVE-2022-39389
At the moment, I don't have enough bandwidth to further investigate if lbcd is impacted, but it seems fine as we only have two implementations (lbcd and lbrycrd), and both have the same witness-size-checking.