refactor: restructure Lighter SDK by removing deprecated Go files and enhancing Python documentation with new examples and models

docs/lighter/lighter-python-main/examples/margin_eth_add_collateral_http.py

@@ -0,0 +1,29 @@
+import asyncio
+from utils import default_example_setup
+
+
+async def main():
+    client, api_client, _ = default_example_setup()
+
+    # Note: the HTTP method `update_margin` receives `usdc_amount` (float) as the argument,
+    # while the WS one that calls `sign_update_margin` to get the TX to send it directly over WS
+    # receives `usdc_amount` (int) as the argument, which is the float one * 1_000_000
+    # this was kept this way to not break backwards compatibility. Ideally, they would be consistent.
+
+    tx, tx_hash, err = await client.update_margin(
+        market_index=0,
+        usdc_amount=10.5,
+        direction=client.ISOLATED_MARGIN_ADD_COLLATERAL
+    )
+
+    print(f"Update Margin {tx=} {tx_hash=} {err=}")
+    if err is not None:
+        raise Exception(err)
+
+    await client.close()
+    await api_client.close()
+
+
+if __name__ == "__main__":
+    asyncio.run(main())
+