feat: add interceptor for error responses

[mojito317]

PR summary

Add interceptor for error response augmentation

Fixes: s1003

PR Checklist

Please make sure that your PR fulfills the following requirements:

• The commit message follows the
  Angular Commit Message Guidelines.
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• New tests
• Build/CI related changes
• Documentation content changes
• Other (please describe)

What is the current behavior?

Cloudant/CouchDB error models are handled by the core with only the error field being processed. Obtaining e.g. the reason field requires additional user code.

What is the new behavior?

The error response is augmented with errors and trace properties.
This improves the way the core handles the error response and enhances the user facing exception string to include the reason.
The trace is the CouchDB request ID which can be used to correlate with logs.

Does this PR introduce a breaking change?

• Yes
• No
  The existing error model fields are retained, the new fields are backwards compatible.

Other information

Add errorResponseInterceptor.
Modify cloudantBaseService to apply interceptor.
New tests in errorResponseInterceptorTest.
Fix service options on test/unit/features/testDataProviders.js.
Add nock for testing.