chore: config assets for multiple chains

- lightning config
- env vars
- bitcoin.conf for different networks
- copy configs in lightningd repo
Signed-off-by: Lakshya Singh <lakshay.singh1108@gmail.com>

assets/testnet-config

@@ -5,4 +5,5 @@ bitcoin-rpcport=18332
 log-level=info
 max-locktime-blocks=288
 important-plugin=/usr/bin/clboss
-clboss-auto-close=true
+clboss-auto-close=true
+bind-addr=0.0.0.0:19735