iroha_wasm_builder progress-bar

[Arjentix]

It will be nice to have a way to get information about current progress of build from iroha_wasm_builder.

As an example of current implementation you can run kagami validator and will see, that it looks like it's stucked.

I believe, there is a way to provide this info from iroha_wasm_builder crate and the display it on user side.

[Arjentix]

Blocked by #2152

[0x009922]

I use a spinner in kagami swarm during the building of the validator:

• [feature] #2373: kagami swarm #3475

We can probably reuse it in kagami genesis and in iroha_wasm_builder itself. If the PR will be merged, ofc.

[0x009922]

This issue is partially addressed by

• [refactor] #3833, #2373, #3601: Split off Kagami #3841

That PR introduces iroha_wasm_builder_cli, which displays spinners while building & optimizing. However, it is not a progress bar. I guess this issue is about displaying a precise progression, e.g. how many crates were already checked/built.

[DCNick3]

1. exposing cargo's output: this will use the native cargo implementation of the progress bar. no longer capturing stdout, so diagnostics go to the console too
2. parsing cargo's progress bar. possible, but requires special handling for the diagnostics: they have to somehow be separated from the progress bar
3. cargo json output: AFAIU it doesn't provide enough information to build the progress bar (we need the total # of jobs)
4. cargo as a library: doesn't help, cargo exposes basically the same API surface as the console API. will either require parsing or reimplementing large parts of the cargo itself. the progress bar is buried in non-public part of the API: https://docs.rs/cargo/latest/src/cargo/core/compiler/job_queue/mod.rs.html#469

I've decided to go with option 1, with possibly switching to 2 if some limitations are to be found