[vividus] Add Vividus expression: toBase64Gzip

[valfirst]

Closes #1337

[sonarcloud]

SonarCloud Quality Gate failed.

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

77.8% Coverage
0.0% Duplication

[codecov]

Codecov Report

Merging #1351 (febdd65) into master (0e00c3b) will increase coverage by 6.29%.
The diff coverage is 80.00%.

@@             Coverage Diff              @@
##             master    #1351      +/-   ##
============================================
+ Coverage     88.98%   95.28%   +6.29%     
+ Complexity     4934     4789     -145     
============================================
  Files           665      667       +2     
  Lines         13450    13485      +35     
  Branches        961      962       +1     
============================================
+ Hits          11969    12849     +880     
+ Misses         1347      505     -842     
+ Partials        134      131       -3     

Impacted Files	Coverage Δ	Complexity Δ
...dus/bdd/expression/StringsExpressionProcessor.java	93.75% <80.00%> (+61.75%)	0.00 <0.00> (-3.00)	⬆️
...bileapp/variable/ClipboardTextDynamicVariable.java	95.00% <0.00%> (-5.00%)	8.00% <0.00%> (+6.00%)	⬇️
.../vividus/bdd/mobileapp/steps/ApplicationSteps.java	100.00% <0.00%> (ø)	12.00% <0.00%> (ø%)
...bdd/mobileapp/configuration/MobileEnvironment.java	100.00% <0.00%> (ø)	3.00% <0.00%> (?%)
...g/vividus/mobileapp/action/ApplicationActions.java	100.00% <0.00%> (ø)	2.00% <0.00%> (?%)
...dus/configuration/DeprecatedPropertiesHandler.java	96.87% <0.00%> (+6.25%)	0.00% <0.00%> (-11.00%)	⬆️
...in/java/org/vividus/configuration/BeanFactory.java	93.93% <0.00%> (+15.15%)	0.00% <0.00%> (-13.00%)	⬆️
...in/java/org/vividus/bdd/log/AllureLogAppender.java	100.00% <0.00%> (+20.00%)	0.00% <0.00%> (-6.00%)	⬆️
...rc/main/java/org/vividus/runner/GenericRunner.java	23.80% <0.00%> (+23.80%)	0.00% <0.00%> (ø%)
...ovy/VariableContextAwareGroovyScriptEvaluator.java	100.00% <0.00%> (+25.00%)	0.00% <0.00%> (-1.00%)	⬆️
... and 44 more

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