Separate out Tls ConnectInfo trait support into separate tls feature (#2402)

## Motivation

#2360 
## Solution


Added the `tls-connect-info` feature which derives from `_tls-any`
feature.

---------

Co-authored-by: Maple Xu <[email protected]>

Author: xumaple

.github/workflows/CI.yml

@@ -234,13 +234,14 @@ jobs:
           echo "PROTOC_INCLUDE=${PROTOC_DIR}/include" >> $GITHUB_ENV
         fi
     - uses: Swatinem/rust-cache@v2
-    - run: cargo hack udeps --workspace --exclude-features=_tls-any,tls,tls-aws-lc,tls-ring --each-feature
+    - run: cargo hack udeps --workspace --exclude-features=_tls-any,tls,tls-aws-lc,tls-ring,tls-connect-info --each-feature
     - run: cargo udeps --package tonic --features tls-ring,transport
     - run: cargo udeps --package tonic --features tls-ring,server
     - run: cargo udeps --package tonic --features tls-ring,channel
     - run: cargo udeps --package tonic --features tls-aws-lc,transport
     - run: cargo udeps --package tonic --features tls-aws-lc,server
     - run: cargo udeps --package tonic --features tls-aws-lc,channel
+    - run: cargo udeps --package tonic --features tls-connect-info
 
   check:
     runs-on: ${{ matrix.os }}

tonic/Cargo.toml

@@ -25,11 +25,12 @@ gzip = ["dep:flate2"]
 deflate = ["dep:flate2"]
 zstd = ["dep:zstd"]
 default = ["router", "transport", "codegen"]
-_tls-any = ["dep:tokio-rustls", "dep:tokio", "tokio?/rt", "tokio?/macros"] # Internal. Please choose one of `tls-ring` or `tls-aws-lc`
+_tls-any = ["dep:tokio", "tokio?/rt", "tokio?/macros", "tls-connect-info"] # Internal. Please choose one of `tls-ring` or `tls-aws-lc`
 tls-ring = ["_tls-any", "tokio-rustls/ring"]
 tls-aws-lc = ["_tls-any", "tokio-rustls/aws-lc-rs"]
 tls-native-roots = ["_tls-any", "channel", "dep:rustls-native-certs"]
 tls-webpki-roots = ["_tls-any","channel", "dep:webpki-roots"]
+tls-connect-info = ["dep:tokio-rustls"]
 router = ["dep:axum", "dep:tower", "tower?/util"]
 server = [
   "dep:h2",

tonic/src/lib.rs

@@ -32,6 +32,10 @@
 //!   [`rustls-native-certs`] crate. Not enabled by default.
 //! - `tls-webpki-roots`: Add the standard trust roots from the [`webpki-roots`] crate to
 //!   `rustls`-based gRPC clients. Not enabled by default.
+//! - `tls-connect-info`: Adds additional implementations of [`Connected`]
+//!   on common TLS connectors. Not enabled by default, unless any of the other `tls-*`
+//!   features are enabled. This feature is useful for when trying to use a custom
+//!   TLS connector with `connect_with_connector` without enabling any `tls-*` features.
 //! - `gzip`: Enables compressing requests, responses, and streams. Depends on [`flate2`].
 //!   Not enabled by default.
 //! - `deflate`: Enables compressing requests, responses, and streams. Depends on [`flate2`].
@@ -78,6 +82,7 @@
 //! [`Codec`]: codec/trait.Codec.html
 //! [`Channel`]: transport/struct.Channel.html
 //! [`Server`]: transport/struct.Server.html
+//! [`Connected`]: transport/server/trait.Connected.html
 //! [`rustls`]: https://docs.rs/rustls
 //! [`client`]: client/index.html
 //! [`transport`]: transport/index.html

tonic/src/transport/server/conn.rs

@@ -1,11 +1,11 @@
 use std::net::SocketAddr;
 use tokio::net::TcpStream;
 
-#[cfg(feature = "_tls-any")]
+#[cfg(feature = "tls-connect-info")]
 use std::sync::Arc;
-#[cfg(feature = "_tls-any")]
+#[cfg(feature = "tls-connect-info")]
 use tokio_rustls::rustls::pki_types::CertificateDer;
-#[cfg(feature = "_tls-any")]
+#[cfg(feature = "tls-connect-info")]
 use tokio_rustls::server::TlsStream;
 
 /// Trait that connected IO resources implement and use to produce info about the connection.
@@ -102,7 +102,7 @@ impl Connected for tokio::io::DuplexStream {
     fn connect_info(&self) -> Self::ConnectInfo {}
 }
 
-#[cfg(feature = "_tls-any")]
+#[cfg(feature = "tls-connect-info")]
 impl<T> Connected for TlsStream<T>
 where
     T: Connected,
@@ -128,14 +128,14 @@ where
 /// See [`Connected`] for more details.
 ///
 /// [ext]: crate::Request::extensions
-#[cfg(feature = "_tls-any")]
+#[cfg(feature = "tls-connect-info")]
 #[derive(Debug, Clone)]
 pub struct TlsConnectInfo<T> {
     inner: T,
     certs: Option<Arc<Vec<CertificateDer<'static>>>>,
 }
 
-#[cfg(feature = "_tls-any")]
+#[cfg(feature = "tls-connect-info")]
 impl<T> TlsConnectInfo<T> {
     /// Get a reference to the underlying connection info.
     pub fn get_ref(&self) -> &T {