Missing support for `platform` param in `images.build`

[Andrea Censi]

The most recent versions of Docker support a platform parameter:

https://docs.docker.com/engine/api/v1.41/#operation/ImageBuild

(This can be used, for example, to build amd64 images on an arm64 machine.)

Currently this parameter is not passed:

aiodocker/aiodocker/images.py

Lines 310 to 319 in 26f4361

 params = { 
     "t": tag, 
     "rm": rm, 
     "q": quiet, 
     "pull": pull, 
     "remote": remote, 
     "nocache": nocache, 
     "forcerm": forcerm, 
     "dockerfile": path_dockerfile, 
 } 

[Andrew Svetlov]

Pull request is welcome!
At least a simple test is required.