fix(lsp): implement deno.suggest.completeFunctionCalls (#20214)

Fixes https://github.com/denoland/vscode_deno/issues/743.
```ts
const items: string[] = ['foo', 'bar', 'baz'];

items.map
// ->
items.map(callbackfn) // auto-completes with argument placeholders.
```

---

We have our own setting for `suggest.completeFunctionCalls`, which must
be enabled:
```js
{
    "deno.suggest.completeFunctionCalls": true,
    // Re-implementation of:
    // "javascript.suggest.completeFunctionCalls": true,
    // "typescript.suggest.completeFunctionCalls": true,
}
```
But before this commit the actual implementation had been left as a TODO.

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