refactor(cli): Make some run params reusable (#13870)

* refactor: extract TelemetryParams and PrometheusParams

* improve run_cmd docs

* extract `RuntimeParams`

* use `normalize`

* keep params types same style

* improve `max_runtime_instances`

* fmt

* add license and improve code

* Update client/cli/src/params/runtime_params.rs

Co-authored-by: Bastian Köcher <git@kchr.de>

---------

Co-authored-by: Bastian Köcher <git@kchr.de>

substrate/client/cli/src/params/runtime_params.rs

@@ -0,0 +1,43 @@
+// This file is part of Substrate.
+
+// Copyright (C) Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+use clap::Args;
+use std::str::FromStr;
+
+/// Parameters used to config runtime.
+#[derive(Debug, Clone, Args)]
+pub struct RuntimeParams {
+	/// The size of the instances cache for each runtime. The values higher than 256 are illegal.
+	#[arg(long, default_value_t = 8, value_parser = parse_max_runtime_instances)]
+	pub max_runtime_instances: usize,
+
+	/// Maximum number of different runtimes that can be cached.
+	#[arg(long, default_value_t = 2)]
+	pub runtime_cache_size: u8,
+}
+
+fn parse_max_runtime_instances(s: &str) -> Result<usize, String> {
+	let max_runtime_instances = usize::from_str(s)
+		.map_err(|_err| format!("Illegal `--max-runtime-instances` value: {s}"))?;
+
+	if max_runtime_instances > 256 {
+		Err(format!("Illegal `--max-runtime-instances` value: {max_runtime_instances} is more than the allowed maximum of `256` "))
+	} else {
+		Ok(max_runtime_instances)
+	}
+}