optional 'begin' when creating a transform

[jmeaster30]

currently the syntax is:

set foo to transform
    return "bar"
end

which is nice and I want to keep that but I feel the following syntax also makes sense:

set foo to transform
begin
    return "bar"
end

The first looks a lot cleaner but the pattern body starts with 'begin' so it would make sense to allow both

[jmeaster30]

This could be for anything with blocks but haven't run into any other cases where it feels off

[jmeaster30]

Added for functions