Deconstruction support for locals

We use Jsonnet to express the Kubernetes API objects. The namespace is quite dense, so we end up with a lot of imports, something like [EDITED FOR CLARITY]:

```
local core = import "core.libsonnet";

local container = core.v1.container;
local claim = core.v1.volume.claim;
local probe = core.v1.probe;
local service = core.v1.service;
local secret = core.v1.secret;
local volume = core.v1.volume;
local configMap = core.v1.configMap;
```

It would be great to have sugar for this, _e.g._, JavaScript-style `import * from "core.libsonnet"`, which would generate `local` definitions similar to those above.

Would doing this upend some important part of the language?