Basic support for insert with on conflict

[Fs02]

Support basic case of insert with conflict

• Ignore
• Replace
• Fragment (for advanced use case)

#217

[codecov]

Codecov Report

Merging #269 (6975d28) into master (423deed) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #269   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           32        33    +1     
  Lines         2723      2737   +14     
=========================================
+ Hits          2723      2737   +14     

Impacted Files	Coverage Δ
mutation.go	100.00% <100.00%> (ø)
on_conflict.go	100.00% <100.00%> (ø)
repository.go	100.00% <100.00%> (ø)

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