schema builder fluency #465
                
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Replacement for: #390
Breaking Changes
Schema.Builderneeds to return the subclassed builder instance rather thanBuilder<S>in order to allow for fluency while building schemas. See related issue.Note: I also renamed
ConstSchema.ConstSchemaBuilderto justBuilderto match the other builders for consistency. I can pull this change back out if you don't want it. Since this PR is already a breaking change, I figured it made sense.