fix: package rename

[JackHamer09]

What :computer:

• Renamed zksync-cli to zkcli

Why :hand:

• Improve branding consistency with zkSync and save some keystrokes for users.

Evidence :camera:

Notes :memo:

• Currently waiting for npm zkcli name dispute to be resolved. Unable to publish at the moment with this error: "Package name too similar to existing package zk-cli"