New Model Macros: pflow_dsl & pflow_json

Add documentation and macros for Petri-net model creation

Checkout the docs for this release: https://docs.rs/pflow-metamodel/0.2.0/pflow_metamodel/

• Added detailed documentation for the pflow_dsl! macro.
• Introduced the pflow_json! macro for creating models from JSON strings.
• Updated examples and tests to demonstrate the usage of the new macros.
• Enhanced inline comments for better code understanding.

v0.1.2

• remove unused zip dependency

Full Changelog: v0.1.1...v0.1.2

v0.1.1

First release on crates.io

Full Changelog: https://github.com/pFlow-dev/metamodel-rs/commits/v0.1.1