database: Replace database package with moov-io/base/database

[alovak]

With this PR we are replacing paygate/pkg/database with moov-io/base/database package. Major changes are:

• now we have /migrations directory where all migrations are stored
• we have to create single SQL query to migrate both databases: SQLite and MySQL
• each time we add new migration file into the /migrations directory, we have to embed the /migrations directory into go-file before we build server binary with make embed-migrations.

@adamdecaf instructions to update Paygate's DB are the same as for Customer's.

[vxio]

Build seems to be failing, looks like a race condition.

[codecov-io]

Codecov Report

Merging #615 (49472fa) into master (3c763df) will decrease coverage by 0.29%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #615      +/-   ##
==========================================
- Coverage   51.73%   51.44%   -0.30%     
==========================================
  Files          95       92       -3     
  Lines        3249     3077     -172     
==========================================
- Hits         1681     1583      -98     
+ Misses       1218     1168      -50     
+ Partials      350      326      -24     

Impacted Files	Coverage Δ
x/route/route.go	88.57% <100.00%> (+4.78%)	:arrow_up:
pkg/transfers/pipeline/notify/mock_sender.go	0.00% <0.00%> (-66.67%)	:arrow_down:
pkg/transfers/pipeline/notify/multi.go	0.00% <0.00%> (-42.86%)	:arrow_down:
pkg/upload/sftp.go	63.42% <0.00%> (-2.86%)	:arrow_down:
pkg/transfers/pipeline/aggregate.go	12.92% <0.00%> (+0.17%)	:arrow_up:
pkg/transfers/pipeline/notify/email.go	63.49% <0.00%> (+1.37%)	:arrow_up:
x/schedule/cutoff.go	86.66% <0.00%> (+49.99%)	:arrow_up:

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