chore: don't rederive wallet keys on every tx #6213
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A small change I've been meaning to do for a while now. the cosmrs' trait bounds on
EcdsaSignergot updated to includeSendandSync, meaning we no longer need to derive private keys on every transaction and instead we can just do it once, on construction.note that I had to deprecate some builder methods as they're no longer safe (i.e. they can possibly panic). They were not removed so it wouldn't break compatibility with the library consumers (looking at VPN-core)
This change is