SDK: Add `PodSlotHashes` API (#2481) #34

Job	Run time
benchmark (solana-sdk, cargo +$rust_nightly bench -p solana-sdk)	1m 36s
benchmark (solana-runtime, cargo +$rust_nightly bench -p solana-runtime)	1m 11s
benchmark (solana-gossip, cargo +$rust_nightly bench -p solana-gossip)	3m 17s
benchmark (solana-poh, cargo +$rust_nightly bench -p solana-poh)	1m 30s
benchmark (solana-core, cargo +$rust_nightly bench -p solana-core)	5m 57s
benchmark (sbf, make -C programs/sbf all, cargo +$rust_nightly bench --manifest-path programs/sbf...	1m 38s
benchmark (solana-accounts-db, cargo +$rust_nightly bench -p solana-accounts-db --bench accounts_...	13m 39s
	28m 48s

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