Deprecate logstranform processor

[codeboten]

Component(s)

processor/logstransform

Describe the issue you're reporting

As the logstransformprocessor readme states, the intention is to deprecate it in favour of the transform processor. What's missing in the transform processor to make this a reality?

Pinging @TylerHelmuth

[github-actions]

Pinging code owners:

• processor/logstransform: @djaglowski @dehaansa

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[TylerHelmuth]

It's been a while since I've done a feature comparison but I think besides ParseJSON I haven't gotten very far in filling in the gaps. This is the original comparison: #9410

[github-actions]

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Pinging code owners:

• processor/logstransform: @djaglowski @dehaansa

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