Merge branch 'frontend' into 'main'

.gitignore

Cargo.lock

Cargo.toml

DESIGN.md

hercules_ir/Cargo.toml

hercules_ir/src/build.rs

hercules_ir/src/ir.rs

hercules_opt/Cargo.toml

hercules_opt/src/forkify.rs

hercules_opt/src/lib.rs

hercules_opt/src/pass.rs

hercules_opt/src/phi_elim.rs

juno_frontend/.gitignore

juno_frontend/Cargo.toml

juno_frontend/README.md

juno_frontend/build.rs

juno_frontend/examples/cava.jn

juno_frontend/examples/matadd.jn

juno_frontend/examples/matmul.jn

juno_frontend/examples/poly_matmul.jn