feat(tax-integrations): Cover tax deduction case for tax integrations #2628
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Context
Lago recently launched integration with tax provider Anrok.
Description
In some scenarios tax is not applied on the sum of all fees (with coupon applied).
Instead, there are scenarios where tax base is less than the sum of the fees (with coupon applied) and it depends mostly on the country (e.g. Texas in the USA).
This PR is covering described case.
tax_base_rate
is included in tax logic and also used to display correct base in the UI/PDF.