Feature: When execute filter's callback, add new parameters.

[tcatche]

What does it do?

When a callback to a registered filter is executed, the parameters passed to the filter are those that have been processed by other filters. The filter executed later may be missing related information.

For example, the internal hexo filter(lib\plugins\filter\post_permalink.js) get Post Object as parameter.
After this filter run, return a permalink and dismisses other Post properties.
And then, other filter after this will lose Post info and only get a permalink parameter without any Post info:

// before
hexo.extend.filter.register('post_permalink', function(data){
  // only `2021/07/22/hello` without other info about the post.
  console.log(data); 
  return data;
});

The code try to solve this, give a new params to filter callback, The filter can get the origin info before other filter process:

// after
hexo.extend.filter.register('post_permalink', function(data, post){
// get more params.
  console.log(data, post); 
  return data;
});

How to test

git clone -b BRANCH https://github.com/USER/hexo.git
cd hexo
npm install
npm test

Screenshots

Pull request tasks

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

[coveralls]

Coverage increased (+0.0009%) to 98.283% when pulling 005a3d4 on tcatche:feature/filter_add_params into 9e3360a on hexojs:master.