Add tracing info to every function under compressor.rs

[heldersepu]

What ❔

Simple change adding more logs to:
prover/crates/lib/keystore/src/compressor.rs

Why ❔

We ran into an error and all we got from the logs was this:

2025-02-01T08:31:54.644781Z INFO zksync_proof_fri_compressor::compressor: Started proof compression for L1 batch: L1BatchNumber(7)
thread 'tokio-runtime-worker' panicked at crates/lib/keystore/src/compressor.rs:115:39:
called Result::unwrap() on an Err value: Os { code: 2, kind: NotFound, message: "No such file or directory" }
2025-02-01T08:31:54.760894Z ERROR zksync_queued_job_processor: Error occurred while processing ProofCompressor job L1BatchNumber(7): "called Result::unwrap() on an Err value: Os { code: 2, kind: NotFound, message: "No such file or directory" }"
Compact raw CRS loading takes 0s

Clearly a file was missing message: "No such file or directory" but no hint at what file was missing `

---

After adding this we get a bit more in the logs enough to figure what file was missing:

2025-02-02T17:55:45.316365Z INFO zksync_proof_fri_compressor::compressor: Started proof compression for L1 batch: L1BatchNumber(7)
2025-02-02T17:55:45.350429Z INFO zksync_prover_keystore::compressor: Reading filepath "keys/setup/setup_compact.key"
2025-02-02T17:55:45.350552Z INFO zksync_prover_keystore::compressor: Reading filepath "/data/keys/plonk_setup_snark_data.bin"
thread 'tokio-runtime-worker' panicked at crates/lib/keystore/src/compressor.rs:115:39:
called Result::unwrap() on an Err value: Os { code: 2, kind: NotFound, message: "No such file or directory" }

Hopefully this change helps someone else save many hours of troubleshooting

Checklist

• PR title corresponds to the body of PR (we generate changelog entries from PRs).
• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.
• Code has been formatted via zkstack dev fmt and zkstack dev lint.