feat: add trust mode configuration

[sergey-melnychuk]

Add "trust mode" config property:

• L1 (query only until the last block committed to Ethereum)
  • Helios will only be necessary here - to query the last committed block
• L2 (query the last block known to the network - not yet committed)
  • No need to query Ethereum here, last known block is used

Consider also:

• L2-hardened (same as L2 but all blocks are verified until the last committed to L1)