ENG-505 local development setup

[lionakhnazarov]

Add initial setup for local T network development

• Created genesis.json for blockchain initialization with predefined accounts and balances.
• Added setup scripts (setup-geth.sh, generate-genesis.sh, check-deployments.sh, deploy-ecdsa-tbtc.sh) to facilitate local development and contract deployment.
• Introduced documentation for building and running the T network locally, including quick start guides and local development instructions.
• Added stub contracts for testing and development purposes, ensuring a complete local environment setup.

This commit lays the groundwork for developers to easily set up and interact with the T network in a local environment.