feat(backtick): support 'wrap' option

[curbengh]

What does it do?

Continuation of hexojs/hexo-util#112.
Alternative (less breaking thanhljs: true) approach to #3766

wrap is currently enabled by default, so codeblock is wrapped in <table>; disable it for simpler/shorter <pre><code>.

All credit to @seaoak

How to test

git clone -b highlight-wrap https://github.com/curbengh/hexo.git
cd hexo
npm install
npm test

Pull request tasks

• Add test cases for the changes.
• Passed the CI test.

[curbengh]

Pending release of hexojs/hexo-util#112.

Released.

[coveralls]

Coverage remained the same at 97.144% when pulling ca22689 on curbengh:highlight-wrap into 77f3e21 on hexojs:master.

[curbengh]

Pending #3829 to test compatibility with [email protected].

[seaoak]

@curbengh Thank you for making this PR!
This is exactly what I will make. 😄

BTW, do you think about codeblock tag plugin?
(the source file is lib/plugins/tag/code.js)

I think whether wrap: option should be added as a inline parameter as follows:

{% codeblock lang:js line_number:false wrap:false %}
const obj = {
    foo: 123
};
{% endcodeblock %}

If "yes", we should update document later.
https://hexo.io/docs/tag-plugins#Code-Block

Maybe it is better to make new PR about codeblock tag plugin.

[curbengh]

BTW, do you think about codeblock tag plugin?

+1 on that, in a separate PR.

[curbengh]

Rebased to include #3829