Finishing TODO in pingora-core rustls listeners to avoid panicking

[omavashia2005]

pingora/pingora-core/src/listeners/tls/rustls/mod.rs

Lines 49 to 60 in e6e677f

	/// Todo: Return a result instead of panicking XD
	pub fn build(self) -> Acceptor {
	// rustls 0.23+ requires an explicit CryptoProvider.
	pingora_rustls::install_default_crypto_provider();
	let Ok(Some((certs, key))) = load_certs_and_key_files(&self.cert_path, &self.key_path)
	else {
	panic!(
	"Failed to load provided certificates \"{}\" or key \"{}\".",
	self.cert_path, self.key_path
	)
	};

Wrapping this in a Result might solve this? PR incoming soon.