bug(source): source does not insert bigint

[kwannoel]

Describe the bug

bigint from source just results in a list of null values.

CREATE MATERIALIZED VIEW dwd_ethereum_erc20_transfer AS SELECT
"sysTimestamp" as sys_timestamp
FROM eth_erc20_event_source;
flush;
CREATE_SOURCE
CREATE_MATERIALIZED_VIEW
FLUSH
dev=> select * from dwd_ethereum_erc20_transfer limit 10;
 sys_timestamp
---------------
(0 rows)

dev=> select * from dwd_ethereum_erc20_transfer limit 10;
 sys_timestamp
---------------
(0 rows)

dev=>
dev=> flush;
FLUSH
dev=> select * from dwd_ethereum_erc20_transfer limit 10;
 sys_timestamp
---------------










(10 rows)

To Reproduce

Used the following branch to stub source values: #7445.

stub json payload:

{"sysTimestamp": 1673000000}

CREATE SOURCE eth_erc20_event_source (
"sysTimestamp" bigint
) with (...) ROW FORMAT JSON;

CREATE MATERIALIZED VIEW dwd_ethereum_erc20_transfer AS SELECT
"sysTimestamp" as sys_timestamp
FROM eth_erc20_event_source;

flush;
select * from dwd_ethereum_erc20_transfer limit 10;

Expected behavior

actual value to be inserted.

Additional context

No response

[kwannoel]

We should have some fuzzing for various source formats, previously mentioned by @neverchanje in #5164. Or test indirectly through benchmark for source also works.