feat: add `useUtilityClasses` prop

Is your feature request related to a problem? Please describe…

Many people actually use bootstrap-vue without bootstrap styles. There are some utility classes already applied to rendered component (p-0, mx-1 etc.). All of them contain !important statement, and complicate custom design system implementation.

Describe the solution you’d like

Maybe, useUtilityClasses prop could solve the problem. To save backward compatibility its default value should be true. But when developer do not want to apply them, just pass false. Is it somehow possible?)

Describe alternatives you’ve considered

A clear and concise description of any alternative solutions or features you’ve considered.

Additional context

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[andrewvasilchuk]

@Hiws, I do not include bootstrap styles at all, design I need to implement is completely different and bootstrap styles will be just overhead. Moreover I use tailwindcss and its utility classes partially coincide with bootstrap’s. These classes just add undesirable styles, that i need to override all the time. bootstrap-vue components can be used without bootstrap styles at all, but for now it’s tightly coupled.

[tmorehouse]

For custom bootstrap vue components, we have removed the user of Bootstrap utility classes (such as p-2, m-4, etc) in favour of custom SCSS/CSS (with the exception of p{?}-0 and m{?}-0 classes)