Add support for inline code styling

When migrating a page with inline code formatting from Confluence 7.19.2 to XWiki 14.10 via  migrator tool, the formatting is gone.

In Confluence this is achieved by applying “Preformatted code” in Confluence WYSIWYG-Editor, resulting in <code>my text</code>  elements:

<p>Lorem ipsum dolor sit amet, <code>consetetur</code> sadipscing elitr, <code>clita kasd gubergren, no sea takimata sanctus</code> est Lorem ipsum dolor sit amet.</p>

Additional info:

The applied style to this in Confluence factory settings is font-only:

font-family: SFMono-Medium,SF Mono,Segoe UI Mono,Roboto Mono,Ubuntu Mono,Menlo,Courier,monospace; 

We use the <code>-tag to apply our own CSS to it, in our case:

code {
  border-radius: 5px;
  color: #000;
  padding: .275em;
  border-radius: 5px;
  font-size: .9em;
  margin  : 0 0.2em 0 0.2em;
  top: -1px;
} 

On XWiki side this results in:

<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p> 

I provided a Confluence package with examples in text, list, and table.

PS: I just discovered CONFLUENCE-56 which is basically the same issue but without provided Confluence package to reproduce. I'm sorry for basically repeating the issue.

Thank you!