Integrate best practices

[tanghel]

• simplified config:
  • have a unified config file for all apps
  • possibility to load library-specific configs (e.g. libs/common)
  • provide config schema that is validated when the app starts
  • generate entities from config schema
• implemented architectural restrictions using the eslint-boundaries component in the eslint file
• simplified start of apps by providing one app-specific start command, with the possibility of overriding the environment (devnet, testnet, mainnet) and applying custom watch or debug fields
• to differentiate between environments, instead of having an environment-specific config, now we provide an environment-specific env file where only the env-specific information is set
• having a generic services component that contains all the business logic