Normalize bytes rather than storing hex representation of bytes (#49)

* add timestamp to ethr builder

* improve coverage

* add `get_query_value` fn to did_url

* clippy

* use AsRef<str>

* timestamp -> block_timestamp, always return error

* store block timestamp in seconds

* fix bugs w.r.t byte conversions

* remove spurious logs

* update jsonrpsee

* remove NANOSECONDS_PER_SECOND

* update lockfile