feat: update link if text and href match

[usman-khalid]

SUMMARY

When a user has an absolute URL while editing a doc, we auto-link it. To make any further updates, we have to manually open the link menu to do it. This PR creates adds a plugin to d automatically update the href if text and href match.

Fixes #710

Other Changes

• Moved isURL util to helpers.js as it's used in three places now.

How Has This Been Tested?

Tested on localhost and https://i710--da-live--usman-khalid.aem.page/

Screenshots (if appropriate):

• 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.

[aem-code-sync]

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