feat(query): top k syntax support

[TCeason]

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Summary

Parameters

n

The maximum number of rows to return in the result set.

Example

select TOP 4 c1 from testable ORDER BY c1;

-- similar to

select c1 from testable order by c1 limit 4;

• Fixes Feature: top k syntax support  #14972

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 

[TCeason]

cc @soyeric128

[andylokandy]

consider adding a test for select top from t1 where top is a column in t1?

[TCeason]

consider adding a test for select top from t1 where top is a column in t1?

Added. And I think TOP should not in is_reserved_ident and is_reserved_function_name