max rent epoch serialization

[jordy25519]

Problem

in the wild RPC (some) providers are returning account 'rentEpoch' as 18446744073709552000
there are multiple bugs on various clients where deserialization is broken but the client libs switched to a big int to accommodate this

the solana-client can't parse this value currently as it exceeds u64.

invalid type: floating point 1.8446744073709552e19, expected u64

example issues caused by this:
go client issue: gagliardetto/solana-go#172 (solved with BigInt)
rust client issue:: regolith-labs/ore#26 (unsolved)

Proposed Solution

Make it clear for solana protocol that maximum rent epoch should never be serialized as anything other than 18446744073709551615

otherwise accept the situation, then solana-client rpc needs special case deserialization to handle the above value

[github-actions]

This repository is no longer in use. Please re-open this issue in the agave repo: https://github.com/anza-xyz/agave