feat(tag): show source of the error & beautify

[SukkaW]

What does it do?

#3859 #4109 #1771

• Show the source file that contains error
  source is available as a property of options that passed to tag.render.
• Beautify the Error
  • The source of error will be colored in magenta while the error type will be in red.

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 (+0.0005%) to 98.238% when pulling 821ef12 on SukkaW:tag-error-source into 064daa4 on hexojs:master.