[VSCode] XML tags support

[yleflour]

Current highlighting with sudolang

Current highlighting with md files

Extra notes

Also, if you could make it so that all of these highlight well, that would be awesome:

Test code is:

<template>
\`\`\`ts
console.log('Hello, world!');
function myFunction() {
  console.log('Hello, world!');
}
\`\`\`
</template>
<template-t>
\`\`\`ts
console.log('Hello, world!');
function myFunction() {
  console.log('Hello, world!');
}
\`\`\`
</template-t>

<template-t>
\`\`\`ts
console.log('Hello, world!');
function myFunction() {
  console.log('Hello, world!');
}
\`\`\`
</template-t>

[yleflour]

BTW make sure to test every type of tags (inline, self closing, with args, ...)

[ericelliott]

Copilot, please use the conventions in syntax-test.sudo to add these syntax highlighting examples. Don't fix the syntax highlighting yet, just add the tests.

Please also add:

"""
An example block quote.
"""