feat(query): support comment syntax

[TCeason]

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Summary

COMMENT [ IF EXISTS ] ON <object_type> <object_name> IS '<string_literal>';

COMMENT [ IF EXISTS ] ON COLUMN <table_name>.<column_name> IS '<string_literal>';

In this pr support object:

1. table
2. column
3. network policy
4. password policy

Example

COMMENT IF EXISTS ON TABLE t IS 'test'
COMMENT ON COLUMN t.C1 IS 'test'
COMMENT ON network policy n1 IS 'test'
COMMENT ON password policy p1 IS 'test'

• fixes: Feature: support comment object #18239

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