Merge #276

276: Remove unused dependencies r=koivunej a=c410-f3r

First commit only adds `default-features = false` where applicable while the second commit future-proofs possible upstream modifications for every single crate.

```
* bitswap

cargo build: 199 -> 179
cargo check: 212 -> 191
cargo test: 201 -> 181


* ipfs

cargo build: 419 -> 341
cargo check: 433 -> 354
cargo test: 445 -> 359


* ipfs-http

cargo build: 518 -> 408
cargo check: 556 -> 429
cargo test: 522 -> 412
```

By looking into the differences, it is possible to see astonishing results across all operations.

Co-authored-by: Caio <c410.f3r@gmail.com>

Author: bors[bot]