net/litep2p: Install the default crypto provider

[lexnv]

This PR installs the default crypto provider before TLS connections are made.

In case another provider was already installed (unexpected but parachains dev might have enabled it), a warning is printed.

Without the fix, litep2p websocket (tokio tungstenite that uses rustls) would panic under the hood:

Thread 'tokio-runtime-worker' panicked at '
Could not automatically determine the process-level CryptoProvider from Rustls crate features.
Call CryptoProvider::install_default() before this point to select a provider manually, or make sure exactly one of the 'aws-lc-rs' and 'ring' features is enabled.
See the documentation of the CryptoProvider type for more information.
            ', /home/akru/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rustls-0.23.36/src/crypto/mod.rs:249

This happens speficially when both aws-lc-rs (legacy) and ring features are enabled by some dependencies that get into the Cargo.lock.

Closes:

• Rustls failure on network startup #11164

[lexnv]

/cmd prdoc --audience node_dev --bump patch

[paritytech-workflow-stopper]

All GitHub workflows were cancelled due to failure one of the required jobs.
Failed workflow url: https://github.com/paritytech/polkadot-sdk/actions/runs/27682016841
Failed job name: check-try-runtime

[paritytech-workflow-stopper]

All GitHub workflows were cancelled due to failure one of the required jobs.
Failed workflow url: https://github.com/paritytech/polkadot-sdk/actions/runs/27682016841
Failed job name: cargo-clippy