[Cleanup] Organize Files in Test folder

[keefertaylor]

High Level Overview of Change

Organize files in the Tests folder.

Context of Change

File hierarchy is now made up of components:

• Common
• ILP
• PayID
• XRP
• Xpring

Each component has a folder: / - Tests /Helpers - Helper files /Fakes - Fakes of objects int he component.

Type of Change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] Refactor (non-breaking change that only restructures code)
• [ ] Tests (You added tests for code that already exists, or your new feature included in this PR)
• [ ] Documentation Updates
• [ ] Release

Before / After

Code doesn't look haphazardly named and organized.

Test Plan

CI

[codecov[bot]]

Codecov Report

Merging #230 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #230   +/-   ##
=======================================
  Coverage   90.01%   90.01%           
=======================================
  Files          42       42           
  Lines         941      941           
=======================================
  Hits          847      847           
  Misses         94       94           

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