chore(migrations): Renaming migration files so that they're easier to keep track of

[craig-rueda]

SUMMARY

Renames all DB migrations (and updates the format in alembic.ini) so that simple alpha sorts will yield the migration order. The current format makes searching through alembic versions cumbersome and this simple fix aims to solve this!

Note that no Alembic revision numbers were harmed in this PR -- just filenames :)

[betodealmeida]

Looks like one of the migrations imports another migration, they need to be fixed:

# superset/migrations/versions/2021-02-18_09-13_c501b7c653a3_add_missing_uuid_column.py
from superset.migrations.versions.b56500de1855_add_uuid_column_to_import_mixin import (

Looks like it's just that one:

% git grep -l 'from superset.migrations.versions'
c501b7c653a3_add_missing_uuid_column.py

[codecov]

Codecov Report

Merging #20284 (40b2bf9) into master (6f0d53e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #20284   +/-   ##
=======================================
  Coverage   66.65%   66.65%           
=======================================
  Files        1729     1729           
  Lines       64910    64910           
  Branches     6842     6842           
=======================================
  Hits        43268    43268           
  Misses      19893    19893           
  Partials     1749     1749           

Flag	Coverage Δ
hive	53.70% <ø> (ø)
mysql	82.28% <ø> (ø)
postgres	82.35% <ø> (ø)
presto	53.56% <ø> (ø)
python	82.78% <ø> (ø)
sqlite	82.09% <ø> (ø)
unit	50.15% <ø> (ø)

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