feat(cli): add CLI command idl to generate IDL from source crate

.github/workflows/ci.yml

@@ -141,9 +141,14 @@ jobs:
 
       - name: Generate MyDemo via CLI
         run: |
-          SAILS_CLI_TEMPLATES_BRANCH=${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/}} ./target/debug/cargo-sails sails new-program ~/tmp --name my-demo
+          SAILS_CLI_TEMPLATES_BRANCH=${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/}} ./target/debug/cargo-sails sails program ~/tmp --name my-demo
 
       - name: Run Tests on MyDemo
         run: |
           cd ~/tmp/my-demo
           cargo test -p my-demo
+
+      - name: Generate IDL from MyDemo via CLI
+        run: |
+          ./target/debug/cargo-sails sails idl --manifest-path ~/tmp/my-demo/Cargo.toml
+          diff ~/tmp/my-demo/target/my-demo-app.idl ~/tmp/my-demo/target/wasm32-unknown-unknown/debug/my_demo.idl

Cargo.toml

@@ -52,6 +52,7 @@ gwasm-builder = { version = "=1.6.2", package = "gear-wasm-builder" }
 # Other deps in alphabetical order
 anyhow = "1"
 cargo-generate = "0.21"
+cargo_metadata = "0.18"
 clap = "4.5"
 convert-case = { package = "convert_case", version = "0.6" }
 futures = { version = "0.3", default-features = false }
@@ -70,6 +71,7 @@ parity-scale-codec = { version = "3.6", default-features = false }
 prettyplease = "0.2"
 proc-macro-error = "1.0"
 proc-macro2 = { version = "1", default-features = false }
+rustdoc-types = "=0.29.1"
 quote = "1.0"
 scale-info = { version = "2.11", default-features = false }
 serde = "1.0"
@@ -78,5 +80,6 @@ spin = { version = "0.9", default-features = false, features = ["spin_mutex"] }
 syn = "2.0"
 thiserror = "1.0"
 thiserror-no-std = "2.0"
+toml_edit = "0.22"
 tokio = "1.40"
 trybuild = "1"

rs/cli/Cargo.toml

@@ -14,5 +14,9 @@ path = "src/main.rs"
 [dependencies]
 anyhow.workspace = true
 cargo-generate.workspace = true
+cargo_metadata.workspace = true
 clap = { workspace = true, features = ["derive"] }
+rustdoc-types.workspace = true
 sails-client-gen.workspace = true
+serde-json.workspace = true
+toml_edit.workspace = true