feat: add hydra migrate status subcommand

[alnr]

...with optional --block flag to wait for migrations to be finished by another instance

[codecov]

Codecov Report

Merging #3579 (17089bf) into master (3914585) will decrease coverage by 0.23%.
The diff coverage is 68.70%.

❗ Current head 17089bf differs from pull request most recent head d77ea36. Consider uploading reports for the commit d77ea36 to get more accurate results

@@            Coverage Diff             @@
##           master    #3579      +/-   ##
==========================================
- Coverage   76.63%   76.41%   -0.23%     
==========================================
  Files         129      130       +1     
  Lines        9639     9714      +75     
==========================================
+ Hits         7387     7423      +36     
- Misses       1754     1792      +38     
- Partials      498      499       +1     

Impacted Files	Coverage Δ
cmd/cli/handler_migrate.go	0.88% <0.00%> (-0.16%)	⬇️
cmd/server/handler.go	1.36% <0.00%> (-0.02%)	⬇️
x/events/events.go	91.30% <66.66%> (-8.70%)	⬇️
persistence/sql/persister_client.go	84.94% <87.50%> (-0.06%)	⬇️
cmd/migrate_status.go	100.00% <100.00%> (ø)
cmd/root.go	94.20% <100.00%> (+0.08%)	⬆️
persistence/sql/persister_oauth2.go	85.53% <100.00%> (+0.58%)	⬆️