Holocene: handle Holocene l1 attributes in l1 data fee computation

[roberto-bayardo]

Description

Holocene introduces a new L1 attributes format which needs to be properly parsed in the L1 cost function calculation, even though in this part of the code, the new attributes do not affect the computation.

Tests

Added unit tests to confirm Holocene-style l1 attributes are handled properly after the Holocene upgrade within l1 data fee related code, and also that Ecotone-style attributes remain handled without error to support the fact that the first Holocene block will have the older style L1 attributes.