programs/sbf: bench running programs with input accounts

[alessandrod]

The existing bpf_loader benches execute transactions with only one input account. This PR adds benches with different account configurations (number and size).

[ryoqun]

@alessandrod #30602 is just landed. this means you need to rebase this pr. otherwise, you would see these errors after merging (ouch)

error: integer arithmetic detected
   --> benches/bpf_loader_accounts.rs:111:51
    |
111 |     bench_program_execute_read_1_100k_account: 1, 100 * 1024, 1,
    |                                                   ^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#integer_arithmetic
    = note: requested on the command line with `-D clippy::integer-arithmetic`

i know this particular clippy complain is too mundane for bench code. maybe resort to #![allow(clippy::integer_arithmetic)]. On the bright side, this indicates that bad changes to those files will be caught very earlier & very quickly with new test-checks.sh on both ci/laptop.

[KirillLykov]

this program might be quite useful to test different stages. Can we add it without, probably, using extensively in CI to avoid too long execution? Or we might be interested in having it in another repo, if we must run these CI
@ilya-bobyr