Change visibility of `svm-internal` structs and APIs #16426

Job	Run time
test_cli (single-pool)	19m 18s
test_cli (single-pool)	19m 18s
cargo-test-sbf (associated-token-account)	6m 57s
cargo-test-sbf (associated-token-account)	6m 57s
check (associated-token-account)	1m 21s
check (associated-token-account)	1m 21s
test_cli (token-2022)	18m 20s
test_cli (token-2022)	18m 20s
check (feature-proposal)	2m 45s
check (feature-proposal)	2m 45s
check (instruction-padding)	1m 9s
check (instruction-padding)	1m 9s
cargo-test-sbf (feature-proposal)	6m 56s
cargo-test-sbf (feature-proposal)	6m 56s
check (memo)	1m 20s
check (memo)	1m 20s
check (record)	1m 2s
check (record)	1m 2s
cargo-test-sbf (instruction-padding)	5m 58s
cargo-test-sbf (instruction-padding)	5m 58s
cargo-test-sbf (memo)	5m 59s
cargo-test-sbf (memo)	5m 59s
check (single-pool)	2m 45s
check (single-pool)	2m 45s
check (slashing)	1m 20s
check (slashing)	1m 20s
cargo-test-sbf (record)	6m 21s
cargo-test-sbf (record)	6m 12s
check (stake-pool)	2m 25s
check (stake-pool)	2m 25s
cargo-test-sbf (single-pool)	6m 33s
cargo-test-sbf (single-pool)	6m 33s
check (token-2022)	2m 36s
check (token-2022)	2m 36s
cargo-test-sbf (slashing)	6m 36s
cargo-test-sbf (slashing)	6m 36s
cargo-test-sbf (stake-pool)	6m 31s
cargo-test-sbf (stake-pool)	6m 31s
cargo-test-sbf (token-2022)	6m 17s
cargo-test-sbf (token-2022)	6m 17s
	3h 44m 49s

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