object-store: could not find header in client for http feature

[kylebarron]

Describe the bug

With object store set as a dependency using:

object_store = {version = "0.7.0", optional = true, features = ["http"]}

I'm getting

error[E0432]: unresolved import `crate::client::header`
  --> /Users/kyle/.cargo/registry/src/index.crates.io-6f17d22bba15001f/object_store-0.7.0/src/http/mod.rs:43:20
   |
43 | use crate::client::header::header_meta;
   |                    ^^^^^^ could not find `header` in `client`

error[E0433]: failed to resolve: could not find `header` in `client`
  --> /Users/kyle/.cargo/registry/src/index.crates.io-6f17d22bba15001f/object_store-0.7.0/src/http/mod.rs:66:32
   |
66 |         source: crate::client::header::Error,
   |                                ^^^^^^ could not find `header` in `client`

Specifically it looks like that mod is only built if one of aws, gcp, or azure are built.

arrow-rs/object_store/src/client/mod.rs

Lines 38 to 39 in b66c57c

	#[cfg(any(feature = "aws", feature = "gcp", feature = "azure"))]
	pub mod header;

To Reproduce

Check out this PR: kylebarron/parquet-wasm#311

> cargo build --features arrow1 --features async

error[E0432]: unresolved import `crate::client::header`
  --> /Users/kyle/.cargo/registry/src/index.crates.io-6f17d22bba15001f/object_store-0.7.0/src/http/mod.rs:43:20
   |
43 | use crate::client::header::header_meta;
   |                    ^^^^^^ could not find `header` in `client`

   Compiling snap v1.1.0
error[E0433]: failed to resolve: could not find `header` in `client`
  --> /Users/kyle/.cargo/registry/src/index.crates.io-6f17d22bba15001f/object_store-0.7.0/src/http/mod.rs:66:32
   |
66 |         source: crate::client::header::Error,
   |                                ^^^^^^ could not find `header` in `client`

Expected behavior

I'm trying to use object store in wasm, so I can use only the http feature.

Additional context

[tustvold]

label_issue.py automatically added labels {'object-store'} from #4796