[plugin-db] Add ability to check one data set contains another data set

[valfirst]

Closes #1658

[ghost]

DeepCode's analysis on #748fc0 found:

• ℹ️ 1 minor issue. 👇

Top issues

Description	Example fixes
Consider checking the presence of the optionals value with isPresent before accessing it with get Occurrences: DatabaseStepsTests.java:459	🔧 Example fixes

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[sonarcloud]

SonarCloud Quality Gate failed.

1 Bug
0 Vulnerabilities
0 Security Hotspots
3 Code Smells

100.0% Coverage
0.0% Duplication

[codecov]

Codecov Report

Merging #1705 (748fc00) into master (dbccfd7) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #1705   +/-   ##
=========================================
  Coverage     95.83%   95.83%           
- Complexity     5090     5114   +24     
=========================================
  Files           716      719    +3     
  Lines         14693    14699    +6     
  Branches       1003     1004    +1     
=========================================
+ Hits          14081    14087    +6     
  Misses          476      476           
  Partials        136      136           

Impacted Files	Coverage Δ
...rg/vividus/bdd/steps/db/DataSetComparisonRule.java	100.00% <100.00%> (ø)
...org/vividus/bdd/steps/db/DataSourceStatistics.java	100.00% <100.00%> (ø)
...n/java/org/vividus/bdd/steps/db/DatabaseSteps.java	99.24% <100.00%> (-0.20%)	⬇️
...rg/vividus/bdd/steps/db/DuplicateKeysStrategy.java	100.00% <100.00%> (ø)
.../java/org/vividus/bdd/steps/db/QueryStatistic.java	100.00% <100.00%> (ø)

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