chore: Simplify tycho-encode

Don't have a cli as a lib. Move that directly inside tycho-encode.rs for simplicity

--- don't change below this line ---
ENG-4246 Took 29 minutes

src/bin/tycho-encode.rs

@@ -1,18 +1,66 @@
 use std::io::{self, Read};
 
-use clap::Parser;
+use clap::{Parser, Subcommand};
 use serde_json::Value;
 use tycho_core::dto::Chain;
-use tycho_execution::encoding::{models::Solution, tycho_encoder::TychoEncoder};
+use tycho_execution::encoding::{
+    errors::EncodingError, evm::encoder_builder::EVMEncoderBuilder, models::Solution,
+    tycho_encoder::TychoEncoder,
+};
 
-mod lib {
-    pub mod cli;
+#[derive(Parser)]
+/// Encode swap transactions for the Tycho router
+///
+/// Reads a JSON object from stdin with the following structure:
+/// ```json
+/// {
+///     "sender": "0x...",
+///     "receiver": "0x...",
+///     "given_token": "0x...",
+///     "given_amount": "123...",
+///     "checked_token": "0x...",
+///     "exact_out": false,
+///     "slippage": 0.01,
+///     "expected_amount": "123...",
+///     "checked_amount": "123...",
+///     "swaps": [{
+///         "component": {
+///             "id": "...",
+///             "protocol_system": "...",
+///             "protocol_type_name": "...",
+///             "chain": "ethereum",
+///             "tokens": ["0x..."],
+///             "contract_ids": ["0x..."],
+///             "static_attributes": {"key": "0x..."}
+///         },
+///         "token_in": "0x...",
+///         "token_out": "0x...",
+///         "split": 0.0
+///     }],
+///     "router_address": "0x..."
+/// }
+/// ```
+#[command(author, version, about, long_about = None)]
+pub struct Cli {
+    #[command(subcommand)]
+    pub command: Commands,
 }
 
-use lib::cli::Cli;
-use tycho_execution::encoding::{errors::EncodingError, evm::encoder_builder::EVMEncoderBuilder};
-
-use crate::lib::cli::Commands;
+#[derive(Subcommand)]
+pub enum Commands {
+    /// Use the Tycho router encoding strategy
+    TychoRouter {
+        #[arg(short, long)]
+        config_path: Option<String>,
+        #[arg(short, long)]
+        swapper_pk: String,
+    },
+    /// Use the direct execution encoding strategy
+    DirectExecution {
+        #[arg(short, long)]
+        config_path: Option<String>,
+    },
+}
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let cli = Cli::parse();