stake-pool-cli: All sorts of fixes (#1650)

While going back through the docs, I ended up doing a lot of the stake
pool CLI items:

* Deposit / withdraw command: Use associated token account by default
* Create command: Allow passing the stake pool and mint keypair (useful
  for testing)
* Create command: Split the transaction for pool creation (required to get under the
  transaction size limit)
* Add / remove validator command: take a validator vote account rather than stake
  account, which makes integration from outside tools a lot simpler
* Update command: add a `--force` flag to force the update
* Update command: add a `--no-merge` flag to not merge while updating
  (useful to allow the pool to work, even if the transient stake
  accounts are unmergeable)
* Withdraw: Add `--use-reserve` flag to withdraw from reserve
* Withdraw: Add `--vote-account` arg to specify which validator to
  withdraw from

Author: joncinque

Cargo.lock

@@ -19,6 +19,7 @@ solana-client = "1.6.6"
 solana-logger = "1.6.6"
 solana-sdk = "1.6.6"
 solana-program = "1.6.6"
+spl-associated-token-account = { path="../../associated-token-account/program", features = [ "no-entrypoint" ] }
 spl-stake-pool = { path="../program", features = [ "no-entrypoint" ] }
 spl-token = { path="../../token/program", features = [ "no-entrypoint" ]  }
 bs58 = "0.4.0"