Issue 21: Create plugin to run Flyway database migrations in pipeline

[kmanning]

• Issue There should be a way to apply automated database migrations #21
• We use terraform-pipeline to manage our databases
• It would be nice to incorporate flyway database migrations into the pipelines that manage our databases
• Create a new plugin to do that.

[codecov-io]

Codecov Report

Merging #358 (378f336) into master (e62499a) will increase coverage by 0.41%.
The diff coverage is 93.02%.

❗ Current head 378f336 differs from pull request most recent head c3a725d. Consider uploading reports for the commit c3a725d to get more accurate results

@@            Coverage Diff             @@
##           master     #358      +/-   ##
==========================================
+ Coverage   79.76%   80.17%   +0.41%     
==========================================
  Files          49       51       +2     
  Lines        1344     1387      +43     
  Branches      302      309       +7     
==========================================
+ Hits         1072     1112      +40     
  Misses        125      125              
- Partials      147      150       +3     

Impacted Files	Coverage Δ
src/FlywayMigrationPlugin.groovy	92.85% <92.85%> (ø)
src/FlywayCommand.groovy	93.33% <93.33%> (ø)

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