Support unparsing implicit lateral UNNEST plan to SQL text

[goldmedal]

Which issue does this PR close?

Closes #13793

Rationale for this change

Support to unparse the implicit lateral unnest plan. Given a SQL

SELECT * FROM unnest_table u, UNNEST(u.array_col)

It can be planned to the logical plan and unparsed back to the SQL

SELECT * FROM unnest_table AS u CROSS JOIN LATERAL (SELECT UNNEST(u.array_col) AS "UNNEST(outer_ref(u.array_col))")

If with_unnest_as_table_factor is enabled, it will be unparsed to

SELECT * FROM unnest_table AS u CROSS JOIN UNNEST(u.array_col)

What changes are included in this PR?

Are these changes tested?

yes

Are there any user-facing changes?

new unparsing behavior