Documentation for custom KEDA scaler for Splunk Observability Cloud

[sschimper-splunk]

With this pull request, I would like to submit documentation on a custom KEDA scaler for Splunk Observability Cloud, which I have developed and which at the moment of this submission resides here. Once I create my pull request for the scaler itself, I will reference this PR for the docs.

Checklist

• [X] Commits are signed with Developer Certificate of Origin (DCO)

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