Parallelization of long-running commands

[programarivm]

Long-running commands need to run in parallel because otherwise will be blocking the event loop.

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• [x] https://github.com/chesslablab/chess-server/issues/381
• [x] https://github.com/chesslablab/chess-server/issues/383
• [x] https://github.com/chesslablab/chess-server/issues/384
• [x] https://github.com/chesslablab/chess-server/issues/385
• [x] https://github.com/chesslablab/chess-server/issues/386
• [x] https://github.com/chesslablab/chess-server/issues/387
• [x] https://github.com/chesslablab/chess-server/issues/388
• [x] https://github.com/chesslablab/chess-server/issues/389
• [x] https://github.com/chesslablab/chess-server/issues/390
• [x] https://github.com/chesslablab/chess-server/issues/391
• [x] https://github.com/chesslablab/chess-server/issues/392
• [x] https://github.com/chesslablab/chess-server/issues/393
• [x] https://github.com/chesslablab/chess-server/issues/394
• [x] https://github.com/chesslablab/chess-server/issues/407
• [x] https://github.com/chesslablab/chess-server/issues/408
• [x] https://github.com/chesslablab/chess-server/issues/409
• [x] https://github.com/chesslablab/chess-server/issues/410
• [x] https://github.com/chesslablab/chess-server/issues/411
• [x] https://github.com/chesslablab/chess-server/issues/412
• [x] https://github.com/chesslablab/chess-server/issues/413