Update `link` to use the attribute template

[ehuss]

New rules:

• ❗ items.extern.attributes.link.allowed-positions
• ❗ items.extern.attributes.link.duplicates
• ❗ items.extern.attributes.link.name
• ❗ items.extern.attributes.link.name.intro
• ❗ items.extern.attributes.link.kind
• ❗ items.extern.attributes.link.kind.intro
• ❗ items.extern.attributes.link.modifiers.intro

Removed rules:

• ❌ items.extern.attributes.link.kind-raw-dylib, items.extern.attributes.link.kind-raw-dylib.intro, items.extern.attributes.link.kind-raw-dylib.import -- moved into note

Renamed rules:

• items.extern.attributes.link.dylib is now items.extern.attributes.link.kind.dylib
• items.extern.attributes.link.static is now items.extern.attributes.link.kind.static
• items.extern.attributes.link.framework is now items.extern.attributes.link.kind.framework
• items.extern.attributes.link.raw-dylib is now items.extern.attributes.link.kind.raw-dylib
• items.extern.attributes.link.name-requirement is now items.extern.attributes.link.name.requirement
• items.extern.attributes.link.modifiers.multiple split into items.extern.attributes.link.modifiers.once and items.extern.attributes.link.modifiers.duplicates
• items.extern.attributes.link.wasm_import_module split into items.extern.attributes.link.wasm_import_module.behavior
• items.extern.attributes.link.kind-raw-dylib.platform-specific moved into items.extern.attributes.link.kind.raw-dylib

[rustbot]

:umbrella: The latest upstream changes (possibly 9c6bcbdc3a37c67892f529a6cab35cef4db2926f) made this pull request unmergeable. Please resolve the merge conflicts.

[rustbot]

This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.