feat: separate simple client into its own module

This will make it easier to import it into other projects without importing all of the other dependencies of our root go.mod

client/go.mod

@@ -0,0 +1,5 @@
+module github.com/Layr-Labs/eigenda-proxy/client
+
+go 1.22.0
+
+toolchain go1.22.7

go.mod

@@ -6,6 +6,7 @@ toolchain go1.22.7
 
 require (
 	github.com/Layr-Labs/eigenda v0.8.5-rc.0.0.20241101212705-fa8776ae648c
+	github.com/Layr-Labs/eigenda-proxy/client v0.0.0-00010101000000-000000000000
 	github.com/avast/retry-go/v4 v4.6.0
 	github.com/consensys/gnark-crypto v0.12.1
 	github.com/ethereum-optimism/optimism v1.9.5
@@ -292,3 +293,5 @@ require (
 
 // We inherit this from OP by forking their Alt-DA server.
 replace github.com/ethereum/go-ethereum => github.com/ethereum-optimism/op-geth v1.101411.2
+
+replace github.com/Layr-Labs/eigenda-proxy/client => ./client/