SCB-741 change payloads database type from varbinary(10240) to blob

[SingleX]

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[coveralls]

Coverage decreased (-0.3%) to 93.023% when pulling aa893a2 on SingleX:SCB-741 into 2c1f574 on apache:master.

[WillemJiang]

@SingleX
Thanks for the PR, We need to keep the stack trace size below 10240 at the same time.

[SingleX]

@WillemJiang PR has been updated, please help to review it again, thanks