Move cataloger mvcc implementation under a different package

[nopcoder]

No description provided.

[codecov-io]

Codecov Report

Merging #946 (f3efa47) into master (95e2125) will increase coverage by 0.30%.
The diff coverage is 73.18%.

@@            Coverage Diff             @@
##           master     #946      +/-   ##
==========================================
+ Coverage   44.19%   44.50%   +0.30%     
==========================================
  Files         143      142       -1     
  Lines       11451    11430      -21     
==========================================
+ Hits         5061     5087      +26     
+ Misses       5770     5708      -62     
- Partials      620      635      +15     

Impacted Files	Coverage Δ
catalog/mvcc/cache.go	11.11% <0.00%> (ø)
catalog/mvcc/cataloger_create_entry.go	94.73% <ø> (ø)
catalog/mvcc/cataloger_create_multipart_upload.go	100.00% <ø> (ø)
catalog/mvcc/cataloger_get_branch_reference.go	78.94% <0.00%> (ø)
catalog/mvcc/cataloger_is_branch_exists.go	0.00% <ø> (ø)
catalog/mvcc/cataloger_reset_branch.go	66.66% <ø> (ø)
catalog/mvcc/cataloger_reset_entries.go	84.61% <ø> (ø)
catalog/mvcc/cataloger_rollback_commit.go	0.00% <0.00%> (ø)
catalog/mvcc/db_branch_scanner.go	87.36% <ø> (ø)
catalog/mvcc/db_lineage_scanner.go	81.03% <ø> (ø)
... and 44 more

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[guy-har]

Looks Good