Add multiline configuration to all Log sources

[jszwedko]

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Use Cases

Users wish to aggregate multiple lines in sources. Some sources support this like file, but others do not. There is the reduce transform but it suffers from two gaps: it is a performance bottleneck due to the lack of #11857 and it is a bit more awkward to use because the multiline config automatically groups lines given their source but this has to be manually done for the reduce transform.

Attempted Solutions

No response

Proposal

Add multiline config to all sources that can accept logs.

References

No response

Version

vector 0.26.0