fix(docs): Add ANALYZE example to Iceberg connector documentation

[garimauttam]

Adds a "Collecting table and column statistics" section to the Iceberg connector docs, paralleling the existing section in the Hive connector docs.

Changes:

Added ANALYZE iceberg.tpch.orders; example
Added ANALYZE ... WITH (columns = ARRAY[...]) example for column-level stats
Added .. _iceberg_analyze: RST anchor for cross-referencing
Fixes: #27065

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[steveburnett]

Thanks for the documentation! Just one nit.

[steveburnett]

LGTM! (docs)

Pull updated branch, new local doc build, looks good. Thanks!

[hantangwangd]

Thanks @garimauttam

[steveburnett]

The CI block for docs-only PRs has been fixed in #27285. Could you rebase to the latest master branch? Then we can move forward and merge this PR.

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