[fix](mv) Support relation implied predicates for nested MV rewrite

[foxtail463]

Problem Summary:

Nested MV rewrite may fail to use predicates carried by a lower MV scan.

CREATE MATERIALIZED VIEW mv_fact AS
SELECT k1, dim_id, sku_type, amount
FROM fact
WHERE sku_type = '1';

CREATE MATERIALIZED VIEW mv_join AS
SELECT f.k1, f.dim_id, f.sku_type, f.amount, d.tag
FROM mv_fact f
JOIN dim d ON f.dim_id = d.dim_id
WHERE f.sku_type = '1';

SELECT f.k1, f.dim_id, f.sku_type, f.amount, d.tag
FROM fact f
JOIN dim d ON f.dim_id = d.dim_id
WHERE f.sku_type = '1';

The lower MV scan semantically carries sku_type = '1'. During nested MV rewrite, this predicate must be visible when matching and compensating predicates for the upper MV. If the MV scan does not carry relation-implied predicates, the rewrite may fail even though mv_join can answer the query correctly.

This change attaches relation-implied predicates when generating MV scans, so predicates guaranteed by lower MV scans can participate in later nested MV matching and compensation.

[hello-stephen]

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[foxtail463]

run buildall