add examples crate

Feat/missing onboard as parachain field

Feat/config dump toml

feat: renamed initial_balance to balance and is_cumulus_based to cumulus_based in ParachainConfig serialization to handle zombienet node version mapping

feat: renamed initial_balance to balance in NodeConfig serialization to handle zombienet node version mapping

feat: added custom Serialize implem to NodeConfig to handle complex condition based on ChainDefaultContext

feat: added Serialization traits to shared types, with custom implementation for wrapper U128 type and Arg enum

Feat/validation context

feat: update ValidationError::PortAlreadyUsed message and added NodeConfigBuilder tests for port validation