Feature request: configuration option for the insert pattern

[ChenfengWei1]

Hello,

I have been using this plugin for a while and am very grateful for your work.

However, the insert pattern for the image seems to be unchangeable, which is essential for people, at least for me, who write blogs in markdown and want to set the size or position for their pictures.

So if it's possible to add a configuration option like pasteImage.insertPattern? Potential config can be like: pasteImage.insertPattern: <cetner><img src=${imageFileName} width=400></img></center>.

I believe this plugin supports this feature(yet cannot work in wsl so far), which might be a useful reference.