fix: should be able to specify breadcrumb alias without @ prefix

[udayvunnam]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows the guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Other... Please describe:

What is the current behavior?

We don't need user to specify {breadcrumb: { alias: '@id' } }
we just need {breadcrumb: { alias: 'id' } } with breadcrumbService.set('@id', 'MapingLabel').

Adding a test to verify this.

Issue Number: fixes #47

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information