Transitioning to Binary Format in fs-storage Crate

[tareknaser]

We should consider migrating to a binary file format for the fs-storage crate. One potential crate is bincode.
For context, I came across some benchmarks for Rust serialization frameworks, which could be valuable. You can find them here.

Additionally, I just noted that the current output from FileStorage does not output a valid JSON file. The output is:

version 2
{"a":"1","b":"2","c":"3"}

It's also worth noting that the file doesn't have .json extension.

[kirillt]

That would be great at some point.

These points seem to be prerequisites for transition to binary format:

• Stabilize APIs
• Integrate with at least several apps
• Benchmark and profile storages

I believe that binary format will speed things up, but we should work on it when performance becomes an issue.