0.3.0

• Update Zig toolchain. We use 0.14.0. This project will not follow the main branch anymore to ensure some level of stability during development. The re-exported zig-overlay provides the used zig compiler via pkgs.zigpkgs.stable.
• Build system improvements. Introduce Project to combine the meta-data into a common type that can be used to create the different project resources within the build script. Using Project can reduce repetition in complex setups
• pgzx.node improvements:
  • Add List type, initNode, asNodePtr
  • Add constant value helpers like intVal, boolVal
  • safeCastNode now accepts an optional node pointer. This allows us to cast null values into the correct target type.
• deprecate pgzx.c in favor of pgzx.pg.
• collections: add helpers to convert List to zig slice