feat(language-service): document links for template refs

[alex-snezhko]

Adds LSP document links for template refs in setup script referencing the corresponding element(s) in the template.

This is a small QoL feature that is useful in my opinion as it makes it clear that the template reference is valid and traversable, in the same manner as the existing CSS class definition document link feature.

Screenshots in VS Code

Overview:

Traversing link targets correct range in template:

Hovering the multi-element ref shows multiple links:

[pkg-pr-new]

Open in StackBlitz

vue-component-meta

npm i https://pkg.pr.new/vuejs/language-tools/vue-component-meta@5385

vue-component-type-helpers

npm i https://pkg.pr.new/vuejs/language-tools/vue-component-type-helpers@5385

@vue/language-core

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-core@5385

@vue/language-plugin-pug

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-plugin-pug@5385

@vue/language-server

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-server@5385

@vue/language-service

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-service@5385

vue-tsc

npm i https://pkg.pr.new/vuejs/language-tools/vue-tsc@5385

@vue/typescript-plugin

npm i https://pkg.pr.new/vuejs/language-tools/@vue/typescript-plugin@5385

commit: fc3976f