feat: use AddPermissionlessValidatorTx

[Nuttymoon]

Linked issues

• Fixes Use AddPermissionlessValidatorTx instead of AddValidatorTx #87

Changes

• SDK
  • Use add_permissionless_validator instead of add_validator (deprecated in Durango)
• CLI
  • Add the signer and signer-format parameters to the avalanche validator add subcommand

Breaking changes

• signer is required when adding a node as validator to the Primary Network

[Nuttymoon]

Tested on Fuji with one of our validators (add a validator to the Primary Network with a signer):

cargo run -- avax validator list --subnet-id 11111111111111111111111111111111LpoYY -n fuji --json | jq '.[] | select(.nodeID == "NodeID-6Pq5DKB1kzJjvnc8KPNSDYfMCsUGJxCyZ")'