feat: Implement download file progress bar (#6018)

Fixes #4617 

This PR introduces a download progress bar using [indicatif](https://github.com/console-rs/indicatif). I used the default download style they showcase in one of their [examples](https://github.com/console-rs/indicatif/blob/main/examples/download.rs) because I think it fits pretty well to the existing color scheme here. But let me know if you prefer something to be restyled. The gif below shows what it looks like (with middle cut out for the sake of brevity):

![progress-bar](https://user-images.githubusercontent.com/7879134/148504443-1205ee4c-ccec-435b-868b-ebe6a0e6c9b6.gif)

nearcore/Cargo.toml

@@ -34,6 +34,7 @@ near-rust-allocator-proxy = { version = "0.3.0", optional = true }
 lazy-static-include = "3"
 tempfile = "3"
 anyhow = "1.0.51"
+indicatif = "0.15.0"
 
 near-crypto = { path = "../core/crypto" }
 near-primitives = { path = "../core/primitives" }

nearcore/src/config.rs

@@ -7,6 +7,7 @@ use std::time::Duration;
 
 use anyhow::{anyhow, bail, Context};
 use hyper::body::HttpBody;
+use indicatif::{ProgressBar, ProgressStyle};
 use near_primitives::time::Clock;
 use num_rational::Rational;
 use serde::{Deserialize, Serialize};
@@ -1165,12 +1166,30 @@ async fn download_file_impl(
     let https_connector = hyper_tls::HttpsConnector::new();
     let client = hyper::Client::builder().build::<_, hyper::Body>(https_connector);
     let mut resp = client.get(uri).await.map_err(FileDownloadError::HttpError)?;
+    let bar = if let Some(file_size) = resp.size_hint().upper() {
+        let bar = ProgressBar::new(file_size);
+        bar.set_style(
+            ProgressStyle::default_bar().template(
+                "{spinner:.green} [{elapsed_precise}] [{wide_bar:.cyan/blue}] {bytes}/{total_bytes} [{bytes_per_sec}] ({eta})"
+            ).progress_chars("#>-")
+        );
+        bar
+    } else {
+        let bar = ProgressBar::new_spinner();
+        bar.set_style(
+            ProgressStyle::default_bar()
+                .template("{spinner:.green} [{elapsed_precise}] {bytes} [{bytes_per_sec}]"),
+        );
+        bar
+    };
     while let Some(next_chunk_result) = resp.data().await {
         let next_chunk = next_chunk_result.map_err(FileDownloadError::HttpError)?;
         file.write_all(next_chunk.as_ref())
             .await
             .map_err(|e| FileDownloadError::WriteError(path.to_path_buf(), e))?;
+        bar.inc(next_chunk.len() as u64);
     }
+    bar.finish();
     Ok(())
 }