Move FAST HTML to FAST Element

[janechu]

Description

During v3 update deprecate the @microsoft/fast-html package, and move the logic of the f-template into @microsoft/fast-component. This should update the define configurations template option to:

Example:

MyElement.define({
     name: "my-element",
     template: waitForTemplate() // example, this will return a Promise<ViewTemplate>
});

This waitForTemplate should have it's own export path (so as not to bloat the package). It should register the f-template custom element once under the hood.