Completing integration tests for major implemented data types

[asfimport]

Umbrella issue to track status of integration testing for remaining data types

Reporter: Wes McKinney / @wesm

Related issues:

• [Integration] Add integration tests for Union types (is a child of)
• Add integration tests for FixedSizeBinary (is a child of)
• Integration tests for Decimal types (is a child of)
• Integration tests for Fixed Size List type (is a child of)
• [Integration][Java] Integration tests for Map type (is a child of)
• [Integration][JS] Integration Tests for Map Type (is a child of)

_{Note: This issue was originally created as ARROW-1277. Please see the migration documentation for further details.}

[asfimport]

Neal Richardson / @nealrichardson:
All linked issues are resolved; we can track other issues with the Integration component and/or Blocker status.