Implement addRuleToNewGroups, onAddRule, onAddGroup, getDefaultOperator props

[jakeboone02]

Fixes #221.

• addRuleToNewGroups
• onAddRule and onAddGroup
• getDefaultOperator/field.defaultOperator

[codecov]

Codecov Report

Merging #224 (f43fa22) into master (be38794) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #224   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           15        15           
  Lines          394       411   +17     
  Branches       136       145    +9     
=========================================
+ Hits           394       411   +17     

Impacted Files	Coverage Δ
src/QueryBuilder.tsx	100.00% <100.00%> (ø)
src/Rule.tsx	100.00% <100.00%> (ø)

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