make bank_client optional in tps-client #4390
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Problem
The tps-client crate brings in really heavy dependencies (solana-runtime) in bank_client.rs. Most usage of tps-client doesn't need this, in particular solana-cli which will have way lighter deps when this gets merged
Summary of Changes
solana_tps_client::bank_client
behind a feature gate. This can't be moved to a separate crate because you run into orphan rule problems