fix: inspect should return one array rather than a stream of array

[weiyuhang2011]

Description

This PR fixes an issue where nerdctl inspect <container1> <image1> return a stream of array rather than one array.

Steps to reproduce the issue

current

> nerdctl inspect container1 image1
[
    {
       <container1-info>
    }
]
[
    {
       <image1-info>
    }
]

fixed

> nerdctl inspect container1 image1
[
    {
       <container1-info>
    },
    {
       <image1-info>
    }
]

Fix: #3006

[AkihiroSuda]

Thanks, can we have a test?

[weiyuhang2011]

Thanks, can we have a test?

Sure, i will add a test.