Improve code_highlight configuration options type to be Partial

[philj0st]

Description

Make it so users of the Highlight Code Plugin don't have to pass all options to the configure wrapper for highlightjs.
The object is only merged with the defaults and then passed to PublicApi::configure which has a type signature itself of:
configure: (options: Partial<HLJSOptions>) => void
https://github.com/highlightjs/highlight.js/blob/4e485f222e8c604b92937870414cf401e9dff31f/types/index.d.ts#L38

Related Issues

Example: I wanted to have the pre code.mermaid-language processed by another plugin so i wanted to add:

site.use(codeHighlight({
    options: {
        noHighlightRe: /^mermaid$/i
    }
}));

Deno-ts then sais:

Type '{ noHighlightRe: RegExp; }' is missing the following properties from type 'Omit<HLJSOptions, "__emitter">': languageDetectRe, classPrefix, cssSelector`

Check List

I assume it's not a big enough change to warrant tests or an entry in CHANGELOG.md.

• Have you read the
  CODE OF CONDUCT
• Have you read the document
  CONTRIBUTING
  • One pull request per feature. If you want to do more than one thing,
    send multiple pull request.
  • Write tests.
  • Run deno fmt to fix the code format before commit.
  • Document any change in the CHANGELOG.md.

[philj0st]

Sorry, I just realised this brakes processCodeHighlight. I will fork it locally properly and add tho this PR.

[philj0st]

I added the non-null assertion for the cssSelector option, if you don't like it, i can change it to:

    function processCodeHighlight(pages: Page[]) {
      const cssSelector = options.options?.cssSelector
      if (cssSelector) {
        for (const page of pages) {
          page.document!.querySelectorAll<HTMLElement>(
            cssSelector
          )
            .forEach((element) => {
              try {
                hljs.highlightElement(element);
                element.removeAttribute("data-highlighted");
              } catch (error) {
                log.error(
                  `Error highlighting code block in ${page.sourcePath}: ${error}`,
                );
              }
            });
        }
      }
    }

[oscarotero]

it's perfect! Thank you!