feat: Make reqwest TLS backend configuration easy.

We provide the choice of `native-tls` or `rust-tls`. If none is
provided, the user can configure on their on similar to how it's done
in `git-repository`.

Please note that a choice now has to be made or HTTPS will not be
available, so use one of…

* blocking-http-transport-reqwest-rust-tls
* blocking-http-transport-reqwest-native-tls

Author: Byron

Diff for: Cargo.lock

@@ -72,7 +72,7 @@ gitoxide-core-blocking-client = ["gitoxide-core/blocking-client"]
 ## Support synchronous 'http' and 'https' transports (e.g. for clone, fetch and push) using **curl**.
 http-client-curl = ["git-repository/blocking-http-transport-curl"]
 ## Support synchronous 'http' and 'https' transports (e.g. for clone, fetch and push) using **reqwest**.
-http-client-reqwest = ["git-repository/blocking-http-transport-reqwest", "reqwest-for-configuration-only", "reqwest-for-configuration-only/rustls-tls", "reqwest-for-configuration-only/trust-dns"]
+http-client-reqwest = ["git-repository/blocking-http-transport-reqwest-rust-tls"]
 ## Use async client networking.
 gitoxide-core-async-client = ["gitoxide-core/async-client", "futures-lite"]
 
@@ -87,7 +87,6 @@ anyhow = "1.0.42"
 gitoxide-core = { version = "^0.20.0", path = "gitoxide-core" }
 git-features = { version = "^0.23.1", path = "git-features" }
 git-repository = { version = "^0.28.0", path = "git-repository", default-features = false }
-reqwest-for-configuration-only = { package = "reqwest", version = "0.11.13", default-features = false, optional = true }
 
 clap = { version = "3.2.5", features = ["derive", "cargo"] }
 prodash = { version = "21", optional = true, default-features = false }

Diff for: Cargo.toml

@@ -40,6 +40,10 @@ blocking-network-client = ["git-protocol/blocking-client"]
 blocking-http-transport-curl = ["blocking-network-client", "git-transport/http-client-curl"]
 ## Stacks with `blocking-network-client` to provide support for HTTP/S using **reqwest**, and implies blocking networking as a whole.
 blocking-http-transport-reqwest = ["blocking-network-client", "git-transport/http-client-reqwest"]
+## Stacks with `blocking-http-transport-reqwest` and enables HTTPS via the `rustls` crate. Note that https isn't available without a selection.
+blocking-http-transport-reqwest-rust-tls = ["blocking-http-transport-reqwest", "reqwest-for-configuration-only/rustls-tls", "reqwest-for-configuration-only/trust-dns"]
+## Stacks with `blocking-http-transport-reqwest` and enables HTTPS via the `native-tls` crate. Note that https isn't available without a selection.
+blocking-http-transport-reqwest-native-tls = ["blocking-http-transport-reqwest", "reqwest-for-configuration-only/default-tls" ]
 
 
 #! ### Other
@@ -128,6 +132,9 @@ async-std = { version = "1.12.0", optional = true }
 ## how a simple unanchored regex of only 'normal' characters would work.
 regex = { version = "1.6.0", optional = true, default-features = false, features = ["std"] }
 
+# For internal use to allow pure-Rust builds without opensssl.
+reqwest-for-configuration-only = { package = "reqwest", version = "0.11.13", default-features = false, optional = true }
+
 document-features = { version = "0.2.0", optional = true }
 
 [target.'cfg(target_vendor = "apple")'.dependencies]

Diff for: git-repository/Cargo.toml

@@ -1,3 +1,4 @@
+//! The `gitoxide` plumbing.
 //! ## Feature Flags
 #![cfg_attr(
     feature = "document-features",