solana: fix stack access violation

[a5-pickle]

This is a breaking change.

Instead of using init_if_needed for swap ATAs, these ATAs are now expected to be created before invoking any of the swap instructions:

• initiate_swap_exact_in
• complete_swap_direct
• complete_swap_payload
• complete_swap_relay

Anchor's init (and init_if_needed) macro directives use a good chunk of stack memory. But the stack access errors aren't detected until runtime. To avoid this completely, we require that the create idempotent Associated Token program instruction be called for each of the swap's source and destination token accounts.

The only instruction having this issue was complete_swap_payload. But we made the swap ATA handling consistent among all of the instructions above.