Add task cli commands

[dfarr]

Claim, complete, and heartbeat tasks.

Commands:

• claim
• complete
• heartbeat

Examples:

resonate tasks claim --id foo --counter 1 --process-id bar --ttl 1m
resonate tasks complete --id foo --counter 1
resonate tasks heartbeat --id foo --counter 1

See promises and schedules for a reference.

[TusharMohapatra07]

Hello, does this issue needs any prerequisite knowledge of cloud ?

[dfarr]

Hello, does this issue needs any prerequisite knowledge of cloud ?

Not at all! This is just request/response from client to server.

[TusharMohapatra07]

Okay then, i'd like to work on this.

[dfarr]

Thank you @TusharMohapatra07 !!!

[dfarr]

Completed by #443