feat: generate sp1 stdin for aggchain proof

[hadjiszs]

Description

Generate the prover inputs for the aggchain proof from the aggsender request and fetched data

• Gather the fep public values
• Feed the aggsender request data into the aggchain proof inputs
• Write the aggregation proof and its vkey in stdin
• Fetch all the EVMStateSketch from the L2
• Retrieve the trusted sequencer address

Fixes #97

PR Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added or updated tests that comprehensively prove my change is effective or that my feature works