refactor(language-service): consistent style of source and virtual code operation

[KazariEX]

Adopt the following naming and logic as much as possible:

const uri = URI.parse(document.uri);
const decoded = context.decodeEmbeddedDocumentUri(uri);
const sourceScript = decoded && context.language.scripts.get(decoded[0]);
const virtualCode = decoded && sourceScript?.generated?.embeddedCodes.get(decoded[1]);
if (!sourceScript?.generated || virtualCode?.id !== '...') {
	return;
}

const root = sourceScript.generated.root;
if (!(root instanceof VueVirtualCode)) {
	return;
}

[pkg-pr-new]

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vue-component-meta

npm i https://pkg.pr.new/vuejs/language-tools/vue-component-meta@5053

vue-component-type-helpers

npm i https://pkg.pr.new/vuejs/language-tools/vue-component-type-helpers@5053

@vue/language-plugin-pug

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-plugin-pug@5053

@vue/language-core

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-core@5053

@vue/language-server

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-server@5053

@vue/language-service

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-service@5053

vue-tsc

npm i https://pkg.pr.new/vuejs/language-tools/vue-tsc@5053

@vue/typescript-plugin

npm i https://pkg.pr.new/vuejs/language-tools/@vue/typescript-plugin@5053

commit: 2c3a766