* chore: extract expirable blockhash record into its own type
* fix: the local latest blockhash cache now fetches and stores lastValidBlockHeight
* fix: allow people to supply a confirmation strategy to sendAndConfirmRawTransaction
* test: upgrade RPC helpers to use blockheight confirmation method
* test: patch up tests to use blockheight based confirmation strategy
* fix: eliminate deprecated construction of Transaction inside simulateTransaction
* test: eliminate deprecated constructions of Transaction in tests
BREAKING CHANGE: Removed binaries solana-localnet and solana-bpf-sdk-install.
Please install the Solana CLI tools to download the BPF SDK and to
install the solana-test-validator binary intead.