[DOC] Update the Tune search performance doc to account for latest Tempo enhancements

[knylander-grafana]

Update the Tune search performance doc with some of the improvements in Tempo.

Questions to ask:

• How can we redo the doc to include some of the new features, like frontend search caching, dedicated columns, vParquet3/4, and other improvements?

References:

• Frontend Search Caching #3225

[knylander-grafana]

@joe-elliott Do we need to update this search tuning doc for the next release?

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[knylander-grafana]

Suraj has written a thorough document for search tuning. I'm converting this document to a Markdown file. It will be merged with the existing Search tuning document.