refactor(state): Allow for passing gasPrice instead of fee and limit

[distractedm1nd]

          The point is, we should have GasPrice at StateModule level too so users can use it more comfortable (like even for basic transfers). We can make this into a separate issue.

Originally posted by @renaynay in https://github.com/celestiaorg/celestia-node/pull/3094#discussion_r1462189368