Add Lava RPC node to default Free RPC Nodes

[tabaktoni]

Add Lava RPC node to default Free RPC Nodes
https://www.lavanet.xyz/get-started/starknet

[Snehagupta1907]

Mind if I take this issue?

[ABAH-99]

I’d like to resolve this.

[tabaktoni]

Until we can deterministically define rpc version on the endpoint and get it every time, we will put this on hold.
Linking closed PR for reference on @PhilippeR26 tests.
#1379