feat(onlyswaps-smoketest): tool to periodically create onlyswaps request

[azixus]

• Periodically execute swaps. It can be configured with the following config:

[[swaps]]
amount = "1_000_000_000_000_000_000" # 1 RUSD (18 decimals)
src_token = "RUSD"
dst_token = "RUSD"
src_chain_id = 84532
dst_chain_id = 43113
label = "rusd_base_sepolia_to_ava_fuji"
interval = "10m"       # Run test every 10 minutes
timeout = "60s"        # Fail if not completed in 60 seconds
recipient = "0x..."    # Optional: specify recipient address, otherwise uses signer's address

• Monitor the outcome of the swap. The following metrics are used:
  • swap_requested{label}: Total number of swaps requested per test label
  • swap_fulfilled{label}: Total number of swaps successfully fulfilled per test label
  • swap_verified{label}: Total number of swaps verified on-chain per test label
  • swap_failed{label,reason}: Total number of failed swaps per test label and failure reason

[CluEleSsUK]

a few nits