[Feature] process `docker build` outputs instead of just `print`ing them

[qwertycxz]

Problem Description

In build_image, the output of docker build are just print to stdout, making it hard to process by applications.

build_image 将 docker build 一股脑输出到了 stdout，上层程序很难对这些输出进行处理。

Proposed Solution

Make print not a bare function, but a callback function which we could determine in BuildConfig.

我想就不要用一个裸的 print 了，可以将其修改成一个回调函数，允许我们在 BuildConfig 中指定。

Affected Component(s)

• Engine
• Sandbox
• Common
• Tools
• Documentation
• Other: ___________

Alternatives Considered

Or we could just using a logger, but there will be concurrent errors:

Step 1/5 : FROM debian:latest   # (FROM TASK A)
Step 1/5 : FROM alpine:latest   # (FROM TASK B)
Step 2/5 : RUN apt-get update   # (FROM TASK A)

也可以直接用 Logger，但会有并发性错误 ↑

Additional Context

A print callback patch is ready.

我已经写好了一个回调函数版的 Patch。

See #481.