Support total executions limit

[noconnor]

Proposed Changes

• Add new test configuration parameter totalExecutions
• Update core code to use totalExecutions
• Updated documentation to explain new parameter usage
• Updated EvaluationContext to calculate test run time correctly

[codecov[bot]]

Codecov Report

Merging #97 (44042e2) into master (4c1335a) will decrease coverage by 1.69%. The diff coverage is 56.66%.

@@             Coverage Diff              @@
##             master      #97      +/-   ##
============================================
- Coverage     92.62%   90.94%   -1.69%     
- Complexity      288      295       +7     
============================================
  Files            23       23              
  Lines           746      762      +16     
  Branches         63       62       -1     
============================================
+ Hits            691      693       +2     
- Misses           47       61      +14     
  Partials          8        8              

Impacted Files	Coverage Δ
...erf/statements/PerformanceEvaluationStatement.java	70.90% <31.25%> (-18.68%)	:arrow_down:
...hub/noconnor/junitperf/data/EvaluationContext.java	97.43% <83.33%> (-1.68%)	:arrow_down:
.../noconnor/junitperf/statements/EvaluationTask.java	89.09% <87.50%> (-5.03%)	:arrow_down:

... and 1 file with indirect coverage changes

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