feat: support nextval as field default value.

[youngsofun]

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Summary

support nextval(a_seq_name) as field defaut value

CREATE SEQUENCE user_id_seq;

CREATE TABLE users (
  id INT DEFAULT NEXTVAL(user_id_seq),
  name VARCHAR
);

limition:

1. not support expr with nextval as a part, e.g. nextval(seq1) + 1
2. when copy into table the above user from stage files
   1. if copy into user(name)..., column id will be generated
   2. if copy into user(id, name)..., column id will come from data files, currently require every row contains column id

fixes #17616

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

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This change is 

[BohuTANG]

@soyeric128 Could you please add the new feature to the documentation? Thanks!