Add flag to suppress autogenerated comments in generated code to minimize diff

[gryumov]

Add flag to suppress autogenerated comments in generated code to minimize diff

ProtoBuf.jl/src/codegen/toplevel_definitions.jl

Lines 151 to 152 in 2e80936

	println(io, "# Autogenerated using ProtoBuf.jl v$(PACKAGE_VERSION) on $(Dates.now())")
	println(io, "# original file: ", p.filepath," (proto", p.preamble.isproto3 ? '3' : '2', " syntax)")