Add paseo network --chain option and chain spec (#2668)

After some conversations around the topic of launching a community
staging network ( [forum post
1](https://forum.polkadot.network/t/a-new-test-network-for-polkadot/4325),
[forum post
2](https://forum.polkadot.network/t/the-new-polkadot-community-testnet/4956)
). And Erin having introduced the community testnet in the [last episode
of AAG](https://www.youtube.com/watch?v=uzJEGVG78_E&t=1612s).

I would like to include the `paseo` options as one of the chains
available for launching using the polkadot node.

Note that the chain spec implementation is not yet included at this
stage.

UPDATE:

Merged master with rebase enabled and introduced quite some noise in
this PR.
Relevant changes are in:
- `polkadot/node/service/chain-specs/paseo.json`
- `polkadot/node/service/src/chain_spec.rs`
- `polkadot/cli/src/command.rs`

---------

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Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
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polkadot/cli/src/command.rs

@@ -91,6 +91,7 @@ impl SubstrateCli for Cli {
 			"polkadot" => Box::new(service::chain_spec::polkadot_config()?),
 			name if name.starts_with("polkadot-") && !name.ends_with(".json") =>
 				Err(format!("`{name}` is not supported anymore as the polkadot native runtime no longer part of the node."))?,
+			"paseo" => Box::new(service::chain_spec::paseo_config()?),
 			"rococo" => Box::new(service::chain_spec::rococo_config()?),
 			#[cfg(feature = "rococo-native")]
 			"dev" | "rococo-dev" => Box::new(service::chain_spec::rococo_development_config()?),

polkadot/node/service/src/chain_spec.rs

@@ -102,6 +102,10 @@ pub fn westend_config() -> Result<WestendChainSpec, String> {
 	WestendChainSpec::from_json_bytes(&include_bytes!("../chain-specs/westend.json")[..])
 }
 
+pub fn paseo_config() -> Result<GenericChainSpec, String> {
+	GenericChainSpec::from_json_bytes(&include_bytes!("../chain-specs/paseo.json")[..])
+}
+
 pub fn rococo_config() -> Result<RococoChainSpec, String> {
 	RococoChainSpec::from_json_bytes(&include_bytes!("../chain-specs/rococo.json")[..])
 }