Add link format conversion between wiki and markdown syntax

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What this task asks for

Add a Link Style rule that converts between Obsidian wiki links or embeds and markdown links or images while preserving ignored regions and edge cases. Add a **Content** rule **Link Style** (alias: `link-style`) to convert between Obsidian wiki links/embeds and markdown links/images. Default-export `LinkStyle` from `src/rules/link-style.ts`. Default heading display: `[[p#h]]` -> `[p > h](p#h)`, `[[#h]]` -> `[h](#h)`. Support nested `[]` in the link label, and treat backslash escapes in the label as literal characters. Support markdown destinations that use `<...>` (for spaces). Optional whitespace around the `<...>` inside the parentheses is allowed (for example `( <My Page> )`). Anything else must be left unchanged.