Implement design_equal command

tests/various/design_equal_fail.ys

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+logger -expect error "Second design missing module top_renamed" 1
+
+read_rtlil <<EOT
+module \top
+  wire width 1 input 1 \a
+  wire width 1 output 2 \y
+  connect \y \a
+end
+EOT
+
+design -save golden
+
+design -reset
+read_rtlil <<EOT
+module \top_renamed
+  wire width 1 input 1 \a
+  wire width 1 output 2 \y
+  connect \y \a
+end
+EOT
+
+design_equal golden

tests/various/design_equal_pass.ys

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+read_rtlil <<EOT
+module \top
+  wire width 1 input 1 \a
+  wire width 1 output 2 \y
+  connect \y \a
+end
+EOT
+
+design -save golden
+design_equal golden
+
+design -save copy
+design_equal copy
+
+design -load golden
+design_equal golden
+design_equal copy