chore(rln_db_inspector): include in wakunode2 binary (#2292)

docs/tutorial/rln-db-inspector.md

@@ -0,0 +1,36 @@
+# rln-db-inspector
+
+This document describes how to run and use the `rln-db-inspector` tool. 
+It is meant to be used to debug and fetch the metadata stored in the RLN tree db.
+
+## Pre-requisites
+
+1. An existing RLN tree db
+
+## Usage
+
+1. First, we compile the binary
+    
+    ```bash
+    make -j16 wakunode2
+    ```
+    This command will fetch the rln static library and link it automatically.
+
+
+2. Define the arguments you wish to use
+
+    ```bash
+    export RLN_TREE_DB_PATH="xxx"
+    ```
+
+3. Run the db inspector 
+
+    ```bash
+    ./build/wakunode2 inspectRlnDb \
+    --rln-relay-tree-path:$RLN_TREE_DB_PATH 
+    ```
+
+    What this does is - 
+    a. loads the tree db from the path provided
+    b. Logs out the metadata, including, number of leaves set, past 5 merkle roots, last synced block number
+