[Lang] Fix string format not support keywords format

[yihong0618]

Related issue = #2552

test here

@ti.kernel
def func(k: ti.f32):
    print(123)
    print("{} abc".format(123))
    print("{} {} {}".format(1, 2, 3))
    print("{} {name} {value}".format(k, name=999, value=123))
    name = 123.4
    value = 456.7
    print("{} {name} {value}".format(k, name=name, value=value))

func(233.3)

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[ailzhang]

LGTM!

[Leonz5288]

LGTM!