Account header flags

[karynemayer]

Description

This PR includes feature flags around the header functionalities, so any chain can choose more easily what features they want to provide.

Test scenarios

The changes on this PR should not cause any behavioral change on any of the current chains.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have cleaned up the code in the areas my change touches
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings
• I have removed any unnecessary console messages
• I have included all english text to the translation file and/or created a new issue with the required translations for the currently supported languages
• I have tested for mobile functionality and responsiveness
• I have added appropriate test coverage

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