Feature or enhancement

Proposal:

press TAB after

import o

shows

object()  oct(      open(     or        ord(

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

### Tasks
- [ ] Design the infrastructure for discovering importable modules
- [ ] Benchmark the cost of adding `import` completion (how long it takes to create the cache, how fluid it is in the end)