[Feature] Support Iceberg branch/tag #48285

SELECT * FROM [catalog.][db.]table@branch("test_branch");

SELECT * FROM [catalog.][db.]table VERSION AS OF 'test_branch';

SELECT * FROM [catalog.][db.]table@branch("test_branch");

SELECT * FROM [catalog.][db.]table VERSION AS OF 'test_branch';

select * from [catalog.][db.]table$refs;

ALTER TABLE [catalog.][db.]table
CREATE TAG tag_name AS OF VERSION version
[RETAIN num DAYS];

ALTER TABLE [catalog.][db.]table
CREATE BRANCH branch_name
[AS OF VERSION version]
[RETAIN num DAYS]
[WITH SNAPSHOT RETENTION num SNAPSHOTS];

ALTER TABLE [catalog.][db.]table DROP BRANCH branch_name;
ALTER TABLE [catalog.][db.]table DROP TAG tag_name;

Insert into [catalog.][db.]table@branch("test_branch") values ();