[AURON #2093] Introduce kafka mock source

[Tartarus0zm]

Which issue does this PR close?

Closes #2093

Rationale for this change

• Since we don’t have a Kafka environment, testing is difficult; therefore, we’ve introduced a simulated Kafka source that allows us to specify the data to be sent, thereby achieving our testing objectives.

What changes are included in this PR?

• add kafka_mock_scan_exec to send mock data
• add support for specifying mock data in the Kafka Table Factory
• add test AuronKafkaSourceITCase and AuronKafkaSourceTestBase

Are there any user-facing changes?

• No

How was this patch tested?

• test via UT

[Tartarus0zm]

@richox @merrily01 hello, CI is Green, PTAL