release-21.2: sql: add plan gist to sampled query telemetry log #83644
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Backport 1/1 commits from #83027 on behalf of @THardy98.
/cc @cockroachdb/release
Partially resolves: #71328
This change adds a plan gist field to the sampled query telemetry log.
The plan gist is written as a base64 encoded string.
Release note (sql change): The sampled query telemetry log now includes
a plan gist field. The plan gist field provides a compact representation
of a logical plan for the sampled query, the field is written as a
base64 encoded string.
Release justification: Category 4: Low risk, high benefit changes to existing functionality