fix: allow removing horizontal padding on VitaminTextField

Changes description

Horizontal leading and trailing padding are added to VitaminTextField. The aim of this PR is to allow removing these padding if desired (and keeping them by default for retrcompatibility). For that, a new boolean property named horizontalPadding has been added to VitaminTextField. Its default value is true (for backward compatibility), and can be set to false either in constructor, of afterwards.

Context

Fixes #89

Checklist

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