FontSizePicker: add "label" and "help" properties

[slaFFik]

What problem does this address?

By default, FontSizePicker component has a "Size" label, and no "help" text, as pictured:

The component does not support label property, like TextareaControl, and no help too.

I would like to be able to describe to users which size this control is controlling. Depending on the application, there can be "internal" font size, "external" font size, smart tag font-size (which is rendering smart tags values in a different font sizes due to a different "weight" of that text), etc.

What is your proposed solution?

I propose to add support for these properties so developers can provide additional context.

[slaFFik]

Realistically the same for the FontFamilyControl component too. Should I create a separate issue?

[slaFFik]

The workaround is to wrap in BaseControl component which does have help and label.

[SainathPoojary]

Thanks for raising the issue, @slaFFik . I’d like to work on this.