statistics: add tidb_enable_stats_owner

[dveeden]

What is changed, added or deleted? (Required)

• Add tidb_enable_stats_owner
• The tidb_auto_analyze% prefix doesn't apply to all variables, so remove it
• sort variables by alphabet

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Do your changes match any of the following descriptions?

• Delete files
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• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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