QuantityInput: Rewrite QuantityInput to not use MUI components

[nnnnat]

Type: major

Describe the bug
The QuantityInput was ported to the component library from the storefront and is built with MUI components. We'd like to rewrite this component to remove the MUI dependence, either by creating a new component or by adding a similar input addornments feature to our current TextInput component.

[aldeed]

Pulling this in to sprint because there are JSS styling problems in production build trying to pull this component into the starter kit app.

[spencern]

@mikemurray do you know roughly how large this issue is?

[loan-laux]

I just found out that QuantityInput was the cause of some weird CSS glitches happening only in production on a client's project. Seems to match @aldeed's description. We were trying to use this component on the Reaction Operator UI. Guess we'll hold off for now.

[aldeed]

@loan-laux Interesting, I thought that issue went away, though I don't know if we ever figured out why QuantityInput was causing it.