Fix stores deadlock (#4950)

* Fix stores deadlock

* fix clippy

* more clippy fixes

* move panic for reading invalid keys into userland instead of in the
hashmap iter method

* apply the same fixes to btreemap

* return a dropped error instead of panicing if the item has been removed

packages/stores/Cargo.toml

@@ -13,6 +13,7 @@ description = "Server function macros for Dioxus"
 dioxus-core = { workspace = true }
 dioxus-signals = { workspace = true }
 dioxus-stores-macro = { workspace = true, optional = true }
+generational-box.workspace = true
 
 [dev-dependencies]
 dioxus = { workspace = true }