Adds buffers and cached bytes to memory-stats datapoint #12409

Job	Run time
check	1m 59s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	19m 32s
test (single-pool/cli, single-pool/program)	21m 28s
test (token-upgrade/cli, token-upgrade/program)	17m 59s
cargo-test-sbf (token/program)	7m 33s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	14m 50s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	11m 10s
cargo-test-sbf (token-upgrade/program)	9m 49s
cargo-test-sbf (feature-proposal/program)	9m 49s
cargo-test-sbf (governance/addin-mock/program, governance/program)	11m 44s
cargo-test-sbf (memo/program)	7m 57s
cargo-test-sbf (name-service/program)	9m 57s
cargo-test-sbf (stake-pool/program)	13m 13s
cargo-test-sbf (single-pool/program)	9m 17s
	2h 46m 17s

Provide feedback