Add a script to get subscribed and onboarded laconicd accounts (#22)

Part of [laconicd testnet validator enrollment](cerc-io/testnet-laconicd-stack#19)

The script:
- Fetches onboarded participants using the configured laconicd GQL endpoint
- Reads a given CSV file with subscribers data
- Fetches all the onboarding txs using given laconicd RPC endpoint
- For each subscriber registered as a participant, maps the laconic pubkey and latest onboarding tx height
- Outputs the result in a CSV

Co-authored-by: Nabarun <nabarun@deepstacksoft.com>
Reviewed-on: cerc-io/testnet-laconicd-stack#22
Co-authored-by: Prathamesh Musale <prathamesh.musale0@gmail.com>
Co-committed-by: Prathamesh Musale <prathamesh.musale0@gmail.com>

scripts/.gitignore

@@ -0,0 +1,3 @@
+node_modules
+dist
+.env