fmt: mark imports as used, when types from them are used in struct declarations (#8810)

vlib/v/fmt/fmt.v

@@ -674,6 +674,7 @@ pub fn (mut f Fmt) struct_decl(node ast.StructDecl) {
 		}
 	}
 	for embed in node.embeds {
+		f.mark_types_import_as_used(embed.typ)
 		styp := f.table.type_to_str(embed.typ)
 		f.writeln('\t$styp')
 	}
@@ -728,6 +729,7 @@ pub fn (mut f Fmt) struct_decl(node ast.StructDecl) {
 		}
 		f.write(strings.repeat(` `, field_align.max_len - field.name.len - comments_len))
 		f.write(field_types[i])
+		f.mark_types_import_as_used(field.typ)
 		attrs_len := inline_attrs_len(field.attrs)
 		has_attrs := field.attrs.len > 0
 		if has_attrs {

vlib/v/fmt/tests/import_selective_expected.vv

@@ -1,10 +1,15 @@
 import math { max, min }
+import cli { Command }
 import math.complex { complex, Complex }
 import os {
 	user_os,
 	file_ext,
 }
 
+struct App {
+	command Command
+}
+
 fn imaginary(im f64) Complex {
 	return complex(0, im)
 }

vlib/v/fmt/tests/import_selective_input.vv

@@ -1,10 +1,16 @@
 import math { max,
 	min,
 }
+
+import cli { Command }
 import math.complex { complex, Complex }
 import os {
 	input, user_os, file_ext }
 
+struct App {
+	command Command
+}
+
 fn imaginary(im f64) Complex {
 	return complex(0, im)
 }