Extract multipart upload implementation from mvcc cataloger

[nopcoder]

Extracting multipart upload handling from cataloger as a package under gateway

• The service is no multiparts.Tracker
• Removed the use of repository, it will track parts based on tracking ID
• Postgres table and index 'gateway_multiparts'

[guy-har]

Looks Great

[codecov-io]

Codecov Report

Merging #989 (f655cef) into master (4f89db9) will decrease coverage by 0.32%.
The diff coverage is 35.61%.

@@            Coverage Diff             @@
##           master     #989      +/-   ##
==========================================
- Coverage   44.58%   44.26%   -0.33%     
==========================================
  Files         142      140       -2     
  Lines       11547    11570      +23     
==========================================
- Hits         5148     5121      -27     
- Misses       5757     5799      +42     
- Partials      642      650       +8     

Impacted Files	Coverage Δ
api/handler.go	70.83% <ø> (ø)
catalog/mvcc/validate.go	88.23% <ø> (-6.21%)	⬇️
gateway/multiparts/tracker.go	0.00% <0.00%> (ø)
gateway/operations/base.go	0.00% <ø> (ø)
gateway/operations/postobject.go	0.00% <0.00%> (ø)
gateway/operations/putobject.go	0.00% <0.00%> (ø)
gateway/handler.go	58.78% <76.47%> (+0.22%)	⬆️
catalog/mvcc/cataloger_create_repository.go	59.25% <0.00%> (-3.71%)	⬇️
stats/collector.go	61.36% <0.00%> (-0.71%)	⬇️
... and 5 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4f89db9...f655cef. Read the comment docs.