Introduced by-name deployment and declare-deploy command

[integraledelebesgue]

Closes #2279

Introduced changes

• sncast deploy now allows to deploy a contract by its name instead of class hash;
  --contract-name and --class-hash arguments are mutually exclusive
• Added a new command - declare-deploy, used to quickly combine declaration with deployment
• Command handlers build contract artifacts:
  • declare, declare-deploy - always
  • deploy - when depolying by name

Checklist

• Linked relevant issue
• Updated relevant documentation
• Added relevant tests
• Performed self-review of the code
• Added changes to CHANGELOG.md