[IDE] Support auto import

[grievejia]

Tracking the support for IDE feature of auto-import

[yangdanny97]

What is this? is it the same as https://github.com/facebook/pyrefly/issues/377 ?

[lisroach]

Fyi this is something users are asking for explicitly internally :)

[MatthewScholefield]

This might be referring to automatically completing symbols from available modules and upon completion, automatically injecting the import for the corresponding symbol. This is slightly different from #377 which is simply about supporting autocomplete when you are manually typing an import name.

[ckuethe]

Yes, I'd like to see the appropriate imports suggested. A little bit related to #317 ...

Here's an example of suggesting a type hint (_MutuallyExclusiveGroup from argparse) without suggesting the appropriate import.

https://pyrefly.org/sandbox/?code=GYJw9gtgBAhiDmAHOBnAplAlhRYQBcoBBBAVwjQDt8AFVNEAGigDkYKVkBjNAKF5iIAXCXjkqteiCgBeYmQrU6IdCAAUASl4R8AD1mxEAOhgATUwH0IpfKRgAbewE8LaXV3ukUmAG5oL8OCkiJraeibmFnBiivhqAEQAtDDxzKZoKPgy8bqpsFz4mGCUMgDkmXj++CCkaKVaOroRltHi1AmJAEZ56ZnZucwwBUUl5fiVFsAO6PUCCChCrOwZ3BhygkbIKv7RKKFAA