[EPIC] Shuffle file execs improvement

[milenkovicm]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

shuffle files execs could be improved in few ways

• make better metrics, especially at reader side
• offload I/O operations to dedicated executor
• offload arrow flight server to dedicated executor

Describe the solution you'd like

there is design document at in #660

Describe alternatives you've considered

Additional context

• Investigate use of comet shuffle #1287
• Proposal for more efficient disk-based shuffle mechanism #660