After saving data from gateway to kafka, iningester cannot be consumed

[bourbonkk]

Describe the bug
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When the storage_type of gateway is set to kafka and storage_type of ingester is set to prometheus, abnormal operation occurs.

To Reproduce
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Expected behavior
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ingester logs

Desktop (please complete the following information):

• OS: [e.g. iOS] fedora
• Browser [e.g. chrome, safari]
• Version [e.g. 22] 36

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[bourbonkk]

As the promtail kafka writer was added, the default kafka encoding was changed to json, so there was a problem in that the gateway transmits the default proto encoding and the inester decodes it as json. Also add logging and set default to proto