feat: phase 1 opts + recursion circuit #5457

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2 errors and 8 warnings

Canceling since a higher priority waiting request for 'PR-1638' exists

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unused import: `p3_maybe_rayon::prelude::IntoParallelIterator`

constant `MAX_SHARD_SIZE` is never used

function `shard_size` is never used

`sp1-stark` (lib) generated 3 warnings (run `cargo fix --lib -p sp1-stark` to apply 1 suggestion)

unused import: `p3_maybe_rayon::prelude::IntoParallelIterator`

constant `MAX_SHARD_SIZE` is never used

function `shard_size` is never used

`sp1-stark` (lib test) generated 3 warnings (3 duplicates)