Implement VRL encoder

[pront]

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Use Cases

We already have a VRL decoder. This ticket is to track the other part of the work i.e. the VRL encoder.

Config snippet:

encoding.codec = "vrl"
encoding.source = '''
    encode_json(.) ?? encode_key_value!(.)

Attempted Solutions

No response

Proposal

No response

References

https://github.com/vectordotdev/vector/issues/13634

Version

No response