tlv-account-resolution: resolve extra metas without per-meta allocation

[stranzhay]

Solana's shared account-resolution library (spl-tlv-account-resolution) rebuilt a temporary list of every account for each extra account meta it resolved. Under Solana's default SBF bump allocator, which does not reclaim deallocated memory, those cumulative allocations can exceed the default 32 KB heap and abort with "out of memory." This matches the transfer-hook failures reported in solana-program-library#7004 and token-2022#66.

The fix builds that list once and appends each newly resolved account as the loop advances, reducing allocation growth from quadratic to linear. A host-side counting allocator measured 75,864 bytes on the base implementation and 13,368 bytes on this branch when resolving 32 extra accounts. Resolution behavior is unchanged, and the existing suite covers chained resolution where one meta derives from a previously resolved account.

The dedicated allocation regression test samples 8, 16, and 32 extra metas and bounds marginal growth, so reintroducing the per-meta rebuild fails the test.

[danenbm]

LGTM. The once-built refs list preserves the existing resolution semantics (later metas can still reference previously resolved accounts in add_to_cpi_instruction via the appended borrows), and the allocation tests are a nice guard. Would be great to land as it directly unblocks transfer-hook usage with larger extra-account-meta lists.

[joncinque]

Thanks for your contribution, looks great overall! Just a small question, then we can land this

[joncinque]

Thanks again!