Runtime and Node refactor

[Szegoo]

Currently, the RegionX-Node repository only has a single runtime, which will be used for the Rococo deployment. Once we make the Rococo deployment and start preparing for the Kusama deployment, we will have a separate runtime for each network, allowing us to progressively release changes.

The runtime directory structure will be as follows:

runtime/
├── rococo/
├── kusama/
└── polkadot/

With this PR, we made modifications to the parachain node so that it is generic over the runtime. This way, it will be simple to add separate runtimes for Kusama and Polkadot.

[notion-workspace]

Separate runtime for Rococo