fix: report raw url for dead links

[bluwy]

Description

With a setup like 中文.md with

[test](./报错信息.md#test)

Before:

(!) Found dead link ./%E6%8A%A5%E9%94%99%E4%BF%A1%E6%81%AF in file /Users/bjorn/Work/oss/vitepress/docs/en/中文.md:1

After:

(!) Found dead link ./报错信息.md#test in file /Users/bjorn/Work/oss/vitepress/docs/en/中文.md:1

This PR renames the linkLines property to linkMetadatas. linkLines was added in #5230 which is recent so it's likely less breaking. Ideally we could consolidate all link-related info into links as an array of objects, but maybe it's not worth breaking still.

Linked Issues

fixes #4992

Additional Context

Couple things I realized that's not related to the PR:

1. If ignoreDeadLinks is a filter function, it looks like we pass the encoded url which probably isn't nice to use with.
2. Link lines didn't take into account of links that are in multiple lines but part of the same paragraph, for example:

   This is a [paragraph](./a)
   and this is the next part in the [paragraph](./b)

   It'll point all links to the first line of the paragraph. I can look into fixing this separately.

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