feat: update for godot 4.5 (#125)

* Add memory pinning to fix cgo pointer checks.
* bump to godot 4.5 on ci
* switch to go 1.25.0
* switch to built-ins to have some methods with value as receivers

feat: godot 4.3 support (#117)

* update codegen for godot 4.3 stable.
* update class registration to use GDExtensionClassCreationInfo3.
* fix class registration to set is_exposed to true.
* document vscode debugging.
* fix PackedInt64Array argument.
* support GDClass arguments.
* implement bitfield flags.
* implement callable bind example.

feat: support packed arrays gdextension calls (#116)

fix: refernce correct macos lib files (#110)

feat: godot 4.2 stable (#104)

* add coroutines section to living doc.
* update CI to build and test.
* update godot-headers.
* minor whitespace changes.

feat: add packed array test (#101)

* add living doc .
* add packed array test.
* update codegen to be more compact.

feat: godot 4.2 beta5 (#100)

* update headers against godot 4.2 beta5.
* apply extension_list.cfg hack until fixed in godot.
* remove dead code.

chore: remove gdextension package name (#99)

* moved all the packages nested in gdextension under pkg.
* rename utility package to gdutilfunc.

chore: variant codegen (#98)

* refactor most of variant under codegen.
* refactor packages under gdextension.
* incorporate goimports into the toolchain.

feat/split into multiple packages (#96)

* split package into several smaller packages.
* update to godot 4.2 beta4.
* windows ci no longer fails to compile because of OOM.