Also removes the code to enforce those limits, including the
`-datacarrier` and `-datacarriersize` config options.
These limits are easily bypassed by both direct submission to miner
mempools (e.g. MARA Slipstream), and forks of Bitcoin Core that do not
enforce them (e.g. Libre Relay). Secondly, protocols are bypassing them
by simply publishing data in other ways, such as unspendable outputs and
scriptsigs.
The *form* of datacarrier outputs remains standardized: a single
OP_Return followed by zero or more data pushes; non-data opcodes remain
non-standard.
Recently added mempool_util implementation probably evolved in parallel with the package RBF one before being submitted as part of ephemeral dust in e2e30e89ba.
