MudForm: IsModified

[steveoandrey]

Is your feature request related to a problem? Please describe.
On EditContext, there is a IsModied property & an EventListener OnFieldChanged. This does not exist on MudForm. Because of this, there is no simple way to find out if the form has changed, as far as I know.

Describe the solution you'd like

A IsModified property on mudform, preferably bindable (@bind-IsModified), to adjust handling when modified -> for example disable some buttons.

Describe alternatives you've considered
Using EditForm as an alternative
Some magic with a hidden field

Awesome library by the way, thank you for all your work

[henon]

ok, this is easy. MudForm already tracks if any of its form controls are touched. We just need to expose the info in a two-way bindable property. Would you PR this?

[steveoandrey]

Ok nice I'll give it a try