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Add transaction size and zaddr output limit checks to z_sendmany #1808
Estimate and check if the size of a transaction, for a given number of taddr and zaddr outputs, will be valid. Based on the current implementation of z_sendmany, one zaddr output requires (at least) one joinsplit. Future optimizations should reduce the number of joinsplits required.
The distribution of value across input notes impacts the number of joinsplits required for a zaddr output e.g. small notes being used to send a big value to a zaddr. We should add more sophisticated checking in future.
Given that the maximum size of a transaction is currently 100,000 bytes, the maximum number of joinsplits in a tx is 55. This is reduced to 54 to be conservative and ensure there is room for CTransaction data.
In practice, we might want to communicate and recommend a user to use upto 50 zaddr outputs, which will require 50 joinsplits, and take around 25-30 minutes to compute on an i7.