fmt: keep comments between and after imports (#8637)

vlib/v/ast/ast.v

@@ -287,6 +287,7 @@ pub:
 pub mut:
 	syms          []ImportSymbol // the list of symbols in `import {symbol1, symbol2}`
 	comments      []Comment
+	next_comments []Comment
 }
 
 // import symbol,for import {symbol} syntax

vlib/v/fmt/fmt.v

@@ -280,6 +280,7 @@ pub fn (mut f Fmt) imports(imports []ast.Import) {
 		already_imported[import_text] = true
 		f.out_imports.writeln(import_text)
 		f.import_comments(imp.comments, inline: true)
+		f.import_comments(imp.next_comments, {})
 		num_imports++
 	}
 	if num_imports > 0 {

vlib/v/fmt/tests/import_keep.vv

@@ -1,5 +1,11 @@
 // import time This should be commented out
 import os
+// between
 import rand
+// first between
+// second between
+import semver
+// after the last import
+// also after the last import
 
-// another comment after imports
+// this comment does not belong to the imports anymore

vlib/v/parser/parser.v

@@ -1918,6 +1918,7 @@ fn (mut p Parser) import_stmt() ast.Import {
 		}
 	}
 	import_node.comments = p.eat_comments(same_line: true)
+	import_node.next_comments = p.eat_comments(follow_up: true)
 	p.imports[mod_alias] = mod_name
 	// if mod_name !in p.table.imports {
 	p.table.imports << mod_name