Phase 1 - PG client initialization

[SkeloGH]

Phase 1 - Configure, initialize, connect and disconnect clients

[CLI] run

• Decouple and create test for params validation
• Decouple and create test for clients initialization
• Decouple and create test for Weaver setup and execution

[CLI] clients

Add support for postgres clients

• [client] family: postgres
• [postgres] db.options: https://github.com/porsager/postgres#all-postgres-options
• [postgres] db.url: 'postgres://username:password@host:port/database'

[App] clients

• WeaverPostgresClient base export
  • constructor
  • _configue
  • connect
  • disconnect
  • _onClientConnect
  • onError