Added URL hash support for post_link tag

[iliayatsenko]

What does it do?

Supports using post_link tag with urls containing hashes. For example {% post_link my-post-slug#my-hash 'My Linked Post Title' %}.

This PR resolves #5333

Screenshots

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Pull request tasks

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

[github-actions]

How to test

git clone -b hash_support_for_post_link_tag https://github.com/iliayatsenko/hexo.git
cd hexo
npm install
npm test

[coveralls]

Pull Request Test Coverage Report for Build 6928927438

Warning: This coverage report may be inaccurate.

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A quick fix for this PR: rebase it; your next report should be accurate.

• 11 of 11 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.001%) to 99.536%

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Totals
Change from base Build 6787520040:	0.001%
Covered Lines:	9006
Relevant Lines:	9048

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💛 - Coveralls

[yoshinorin]

Thank you :)