Heuristic/loose completions for the 'any' type

Motivation

Today, if you have a value of type 'any', dotting off of the value and requesting members for completion will return nothing back. The original motivation for this was that we should never risk giving users incorrect completions.

This is great for a fully typed TypeScript project. However, for those migrating to TypeScript, as well as those who need to drop down to any fairly frequently, this can be slightly frustrating.

For those used to the JS editing experience in editors like Sublime where they just "got completions", the current behavior might be seen as unattractive.

Proposal

We should consider adding a language service option for users to get "loose" completions akin to what we give in the Salsa language service.

We can still keep the warning for each completion, but we should provide completions with a builder.

首先阅读提案，并比较 issue 中提到的现有 Salsa 语言服务行为。确定用于宽松补全的语言服务选项的范围，包括警告应如何保持关联，以及什么样的补全行为可以表明该功能已经完成。