fix(language-server): memorize URI conversion results of synchronized documents

[johnsoncodehk]

Fixes withastro/language-tools#802

[johnsoncodehk]

/ecosystem-ci run

[volar-ecosystem-ci]

📝 Ran ecosystem CI on b098e34: Open

suite	result	latest scheduled
astro	❌ failure	❌ failure
mdx	✅ success	❌ failure
services	❌ failure	❌ failure
vue	❌ failure	❌ failure

[volar-ecosystem-ci]

📝 Ran ecosystem CI on b098e34: Open

suite	result	latest scheduled
astro	❌ failure	❌ failure
mdx	✅ success	❌ failure
services	❌ failure	❌ failure
vue	❌ failure	❌ failure

[johnsoncodehk]

/ecosystem-ci run

[volar-ecosystem-ci]

📝 Ran ecosystem CI on bb1a5ca: Open

suite	result	latest scheduled
astro	✅ success	❌ failure
mdx	✅ success	❌ failure
services	✅ success	❌ failure
vue	✅ success	❌ failure

[johnsoncodehk]

/ecosystem-ci run

[volar-ecosystem-ci]

📝 Ran ecosystem CI on 21af8b2: Open

suite	result	latest scheduled
astro	✅ success	❌ failure
mdx	✅ success	❌ failure
services	✅ success	❌ failure
vue	❌ failure	❌ failure