py/lexer: Wrap in parenthesis all f-string arguments passed to format.

This is important for literal tuples, e.g.

    f"{a,b,}, {c}" --> "{}".format((a,b), (c),)

which would otherwise result in either a syntax error or the wrong result.

Fixes issue #9635.

This work was funded through GitHub Sponsors.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

tests/basics/string_fstring_debug.py.exp

@@ -4,3 +4,6 @@ a x=1 b 2 c
 a x=00000001 b 2 c
 a f() + g("foo") + h()=15 b
 a f() + g("foo") + h()=0000000f b
+a 1,=(1,) b
+a x,y,=(1, 2) b
+a x,1=(1, 1) b