no size limit on validator metadata storage

[thibault-ketterer]

There is an issue in the validator change metada storage
there is no size limit on the size you could store in the validator metadata fields
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I think it may lead to problems, storage oversize, waste of BC space.

namada/crates/proof_of_stake/src/storage.rs

Line 680 in 2535c9c

pub fn write_validator_description<S>(

I made some tests on the the only limitation I had was the tx max size, but I was able to store 1MB of "A" in the description field
but my local campfire did not crashed

I have a client that writes the 1MB of data in the desciption field you need it

just hacked cli.rs to send 1MB instead of the command line arg it received

I think you should truncate the data to whatever size you think is good for the different fields

note: the class S bug has been reported this night
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[brentstone]

This is also noted in #2800, with the accompanying #2845 that will be included in the next release.