cli: Command to fetch chainSpec and optimise its size (#1278)

* cli: Add chainSpec command

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* cli/chainSpec: Move to dedicated module

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* cli: Compute the state root hash

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* cli: Remove code substitutes

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* artifacts: Update polkadot.json

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* scripts: Generate the chain spec

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* cli: Remove testing artifacts

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* cli: Fix clippy

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* cli: Apply rustfmt

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* cli: Introduce feature flag for smoldot dependency

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* cli: Rename chain-spec to chain-spec-pruning

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* scripts: Update chain-spec command

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

---------

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

cli/src/main.rs

@@ -18,6 +18,7 @@ enum Command {
     Diff(commands::diff::Opts),
     Version(commands::version::Opts),
     Explore(commands::explore::Opts),
+    ChainSpec(commands::chain_spec::Opts),
 }
 
 #[tokio::main]
@@ -32,5 +33,6 @@ async fn main() -> color_eyre::Result<()> {
         Command::Diff(opts) => commands::diff::run(opts, &mut output).await,
         Command::Version(opts) => commands::version::run(opts, &mut output),
         Command::Explore(opts) => commands::explore::run(opts, &mut output).await,
+        Command::ChainSpec(opts) => commands::chain_spec::run(opts, &mut output).await,
     }
 }