Reorder steps in *Builder so that immutable inputs occur before mutable inputs

[realityforge]

It seems reasonable that components should have immutable/key contributing props earlier in the *Builder classes than later. We could do this by reordering the inputs when generating the builder or by detecting the declaration ordering and objecting if it does not follow this convention.

detecting ordering is complex as we would likely want to guarantee an ordering such as

• source=context, immutable=true
• source=context, immutable=false
• source=user, immutable=true
• source=user, immutable=false

However, we would still need to do this for each level of inheritance hierarchy and this seems complex and overly burdensome on the developers.