pg_restore: Use dependency-based matching for STATISTICS DATA

pg_restore: Use dependency-based matching for STATISTICS DATA

The previous approach introduced by 0dd93de69e80 was weak in terms of
name matching, as an --index=foo could match with a table with the same
name but from a different schema, pulling in more data than necessary.

For example, imagine the following case:
CREATE SCHEMA s1;
CREATE SCHEMA s2;
CREATE TABLE s1.foo (id int);
INSERT INTO s1.foo SELECT generate_series(1,100);
ANALYZE s1.foo;
CREATE TABLE s2.bar (id int);
CREATE INDEX foo ON s2.bar(id);
INSERT INTO s2.bar SELECT generate_series(1,100);
ANALYZE s2.bar;

A targetted pg_restore --index=foo would grab the relation and attribute
stats of s1.foo on top of the index s2.foo, which is incorrect.  This
commit fixes this scenario by relying on a lookup of the dependencies of
a STATISTICS DATA TOC entry, checking if a TOC entry depends on an index
or another relkind before matching with the names of the objects wanted
for the restore.

Discussion: https://postgr.es/m/ajDBwpxs-otl585H@paquier.xyz
Backpatch-through: 18