temporarily use forked id-arena

use alloc BTreeMap and BinaryHeap

use alloc BTreeMap and BTreeSet instead of std HashMap and HashSet

import misc items from core/alloc instead of std

use core Error, FromStr, and Debug

add std feature and gate things behind it

use different IndexMap/IndexSet for std vs no_std

misc alloc imports

add cargo check

update workspace anyhow

fixes

use new instead of default

make HashMap newtype

remove collections mod