make the sdk wasm32-wasi compatible

[Mossaka]

Currently the azure-core has a dependency on reqwest, which is depended on wasm-bindgen. This package can only be used to compile to wasm32-unknown-unknown target, used in browser.

However, this prevent the crate to be compatible to wasm32-wasi target.

Could we make the dependency on reqwest an optional feature?

[cataggar]

Yes, we'll accept pull requests to make it truly optional. It is already marked as optional in azure_core:

azure-sdk-for-rust/sdk/core/Cargo.toml

Lines 28 to 30 in 66db4b4

	reqwest = { version = "0.11", features = [
	"stream",
	], default-features = false, optional = true }

[cataggar]

#755 is in draft to fix this.

[Mossaka]

Huge thanks!

[cataggar]

I think #939 completed this.