More storage iteration methods

[x] Add three methods to the Storage traits: scan_keys, scan_values, remove_range
[x] Use the new methods in grug_storage::{Map, Set}
[x] Add the methods to grug_app::{CacheStore, PrefixStore, SharedStore}
[x] Add the methods to grug_db_disk::{StateCommitment, StateStorage}
[x] Add the methods to grug_db_memory::{StateCommitment, StateStorage}
[x] Add the imports in grug_vm_wasm
[x] Add the imports in grug_wasm

left-curve / grug