Hotfix for failing load_traces task due to value not fitting in the NUMERIC data type

[medvedev1088]

What?

Hotfix for failing load_traces task due to value not fitting in the NUMERIC data type

How?

Change the datatype STRING when loading, use SAFE_CAST() when merging

Example tx with large value: https://etherscan.io/tx/0x00ed8efcf66cc13022770c253de4f15edbf53a07471e3ce49913fae12098d6aa

More transactions with large value:

select *
from bigquery-public-data.crypto_ethereum.traces
where date(block_timestamp) = '2024-07-03'
and value is null