sql/stats: add table setting to disable generation of stats forecasts

[cockroach-teamcity]

Exalate commented:

Related PR: cockroachdb/cockroach#86986
Commit: cockroachdb/cockroach@f5936b0

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Release note (sql change): Add a new table setting
sql_stats_forecasts_enabled which controls whether statistics
forecasts are generated for a specific table. When set, this overrides
cluster setting sql.stats.forecasts.enabled.

Jira Issue: DOC-5501

[michae2]

(By table setting I meant this is a storage parameter as discussed on https://www.cockroachlabs.com/docs/stable/cost-based-optimizer.html#enable-and-disable-automatic-statistics-collection-for-tables and on https://www.cockroachlabs.com/docs/stable/with-storage-parameter.html etc.)