fix: Support Flexible Parsing

[FentPams]

Description

When the format Audience: mobile or Campaign: c1 appears in page metadata

The space after the colon will be read as hypen, for example:

which could possibly cause potential issue when we extracting the value by applying the substring based on the string length:

const key = meta.getAttribute('name')
      ? meta.getAttribute('name').substring(scope.length + 1)
      : meta.getAttribute('property').substring(scope.length + 2);

To make it more robust on taking either Audience:mobile, or Audience: mobile, or even more crazy Audience: mobile. the function for handling the hyphen is introduced. The key we take from the properties will be handled by removing all leading hypen.

After handling hyphens:

Types of changes

• 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 change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@          Coverage Diff          @@
##             v2      #37   +/-   ##
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  Coverage      ?   94.09%           
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  Files         ?        1           
  Lines         ?      677           
  Branches      ?       11           
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  Hits          ?      637           
  Misses        ?       29           
  Partials      ?       11           

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