Restructure node graph execution to be safer (#1277)

* Reorganize file structure

* Remove all unsafe code

* Add testcase for debugging ub

* Convert into proper test with fail condition

* General cleanup

* Fix tests

* Add feature guard for deallocation

* Use raw pointer for storing values to avoid violating aliasing rules

* Add comment explaining the disabling of simd128

* Fix brush node

* Fix formatting

Cargo.lock

@@ -1762,6 +1762,7 @@ dependencies = [
  "derivative",
  "dyn-any",
  "env_logger",
+ "futures",
  "glam",
  "graph-craft",
  "graphene-core",
@@ -2206,6 +2207,7 @@ dependencies = [
  "num-traits",
  "once_cell",
  "serde",
+ "typed-arena",
 ]
 
 [[package]]
@@ -5010,6 +5012,12 @@ version = "0.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "375812fa44dab6df41c195cd2f7fecb488f6c09fbaafb62807488cefab642bff"
 
+[[package]]
+name = "typed-arena"
+version = "2.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6af6ae20167a9ece4bcb41af5b80f8a1f1df981f6391189ce00fd257af04126a"
+
 [[package]]
 name = "typenum"
 version = "1.16.0"