Auto-format imports using Module granularity

[Xanewok]

Part of #155

This is going to be a fun one 😆

I've pushed two preview commits: the first one imports using the Crate granularity, the other one with Module granularity.

Disclaimer: I'm biased 😃 I've used this style since I started using Rust and it's also being used by vast majority of projects in the ecosystem that I've used or looked at; it's also used by the Rust compiler, Cargo and the tools like Rustfmt or Clippy.

Here's a summary of the possible options: rust-lang/rustfmt#3362.

Here is an RFC discussion about setting on a variant: rust-lang/style-team#140, I highly recommend reading it.
To give a brief summary, it seems that people stand behind two options:

• Module - good trade-off between readability and conciseness
• Item - minimizes conflicts when many people edit the same files often

To bring back some of the arguments raised in favor of the Module and explain some of my reasoning as well:

• it naturally settles on the module as the, well, module/boundary from which items can be imported...
• thus, helps build the intuition how to use and structure Rust crates
• less verbose than Java-style (Item) imports, which can often explode and take unreasonable amount of space (and we don't really benefit enough from minimized conflicts as we probably won't be a team of 50 or the like)...
• but repeats enough information to quickly trace a module path rather than having to reconstruct the paths from the crate-style use import tree...
• and already often takes less space in our case, line-wise;
• quite good greppability

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[OmarTawfik]

Left one suggestion about super::* imports, but not blocking.