[I] Object store builder blocks on IO when building [arrow-rs]

[via GitHub]

chebbyChefNEQ opened a new issue, #6469:
URL: https://github.com/apache/arrow-rs/issues/6469

   **Describe the bug**
   Cloud based (tested for GCS) store builder blocks on file IO synchronously 
in `.build`. This happens by:
   `object_store` -> `reqwest::ClientBuild::build` -> `rustls::load_native_cert`
   
   **To Reproduce**
   ```rust
   use object_store::gcp::GoogleCloudStorageBuilder;
   
   fn main() {
       for _ in 0..100 {
           let start = std::time::Instant::now();
           let _gcs = 
GoogleCloudStorageBuilder::from_env().with_bucket_name("some-bucket").build().unwrap();
           println!("built in: {:?}", start.elapsed());
       }
   }
   ```
   
   **Expected behavior**
   calling `build` should return a future and not block
   
   **Additional context**
   I'll create a ticket in `reqwest` as well, but maybe we could capture the 
client build in `tokio::spawn_blocking` for the time being?


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