Kariel myrr/#4 run requests in parallel

[Kariel-Myrr]

Description

Motivation:

We want to run sequence operations with backend in concurrency.

Solution:

• Used Async effect
• Used sequenceConcurrently instead of forM
• Used MVar instead of StateT

Some benchmarks:

Created 1000 entries.

           Async | Sync
      Copy-Async | Copy-Sync
real    0m7.092s | real 0m8.113s
user    0m3.757s | user 0m3.394s
sys 0m1.078s | sys  0m1.102s
    Rename-Async | Rename-Sync
real    0m8.503s | real 0m9.078s
user    0m4.357s | user 0m4.138s
sys 0m1.285s | sys  0m1.204s
      View-Async | View-Sync
real    0m0.958s | real 0m1.286s
user    0m0.485s | user 0m0.414s
sys 0m0.224s | sys  0m0.209s
    Delete-Async | Delete-Sync
real    0m1.991s | real 0m2.573s
user    0m0.928s | user 0m0.899s
sys 0m0.440s | sys  0m0.396s

Related issue(s)

Fixed #4

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