Add get_blocks and get_slot methods to bench-tps-client #306

Job	Run time
cargo-test-sbf (token/program)	7m 14s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	13m 42s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	9m 51s
check	0s
cargo-test-sbf (token-upgrade/program)	7m 24s
cargo-test-sbf (feature-proposal/program)	6m 59s
test	0s
cargo-test-sbf (governance/addin-mock/program, governance/program)	13m 28s
cargo-test-sbf (memo/program)	9m 53s
cargo-test-sbf (name-service/program)	7m 12s
cargo-test-sbf (stake-pool/program)	10m 25s
cargo-test-sbf (single-pool/program)	8m 20s
	1h 34m 28s

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