Add configurable error report behavior via ErrorReportConfiguration

[JooHyukKim]

(note: started from in google groups discussion and follow up of #1043 )

Motivation

Currently there is not a user-friendly way to configure how error report is made. So when the issue is resolved, user would be able to perform following configurations.

• Configure maximum length of token to include in error messages
• Configure maximum length of raw content to include in error messages

Modifications

This issue will be used to contain the sub-PRs that are broken down from the very original PR #1043. Currently planned ones are

• First, Add new ErrorReportConfiguration type with builder, unit test(s)
  • Add ErrorReportConfiguration #1067
• Retrofit IOContext with new ErrorReportConfiguration
  • Retrofit IOContext with ErrorReportConfiguration #1068
• Retrofit ContentReferece
  • Retrofit ContentReference with new ErrorReportConfiguration #1070
• Change TSFBuilder / JsonFactory to allow configuring and holding on to that config object
  • Implement new JsonFactory.builder().errorReportConfiguration() #1072
• Minor clean-up, JavaDoc etc...

[cowtowncoder]

Completed!

[JooHyukKim]

Thanks! @cowtowncoder