:sparkles: Error from USI API modeled as ValidationResult

[bunop]

Description

With this PR errors returned by USI during submission into BioSamples are modeled like errors in validation, in order to easily map which sample has issues from BioSamples point of view. Errors are partially modelled like validation errors in database: Since is not possible to map an error to a particoular column, it isn't possible to start the batch update process from such error: batch updates are columns specific and for such reason error views don't have links to batch update pages

Related Issue

closes #13

Motivation and Context

This change will map BioSamples errors like validation error. This change will be useful when the option to filter out samples relying on their status will be provided

How Has This Been Tested?

Tests were performed with unittest and by submitting data to biosamples test environment during an issue in such environment

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [x] Refactoring (non-breaking change which improve code itself)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[coveralls]

Coverage increased (+0.01%) to 97.945% when pulling e6eca643fa968cf95a6627bac862cf621dbd14e6 on issue-13 into ba9252e7b14fac85a635c5ea3d8d12044efe2b83 on devel.