[Review only] Multiple VAT Number refactoring

[ventselartur]

This pull request contains the changes which are only to show to partners and then abandon the PR.
The idea of the changes it to avoid making the interface implementation public and instead move the methods with integration events out to the facade codeunit.

[github-actions]

Could not find a linked ADO work item. Please link one by using the pattern 'AB#' followed by the relevant work item number. You may use the 'Fixes' keyword to automatically resolve the work item when the pull request is merged. E.g. 'Fixes AB#1234'

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