feat: support multi-table insert

[SkyFan2002]

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Summary

Syntax

-- Unconditional multi-table insert
INSERT [ OVERWRITE ] ALL
  intoClause [ ... ]
<subquery>

-- Conditional multi-table insert
INSERT [ OVERWRITE ] { FIRST | ALL }
  { WHEN <condition> THEN intoClause [ ... ] }
  [ ... ]
  [ ELSE intoClause ]
<subquery>

Where:

intoClause ::=
  INTO <target_table> [ ( <target_col_name> [ , ... ] ) ] [ VALUES (<source_col_name>[ , ... ] ) ]

Integrate with other features (Now)

• Transaction. Multi-table insert loads data into multi table atomatically, and it can be used in a multi-stmt transaction.
• Change tracking
• Cluster key
• Computed column
• Distributed execution

Next step

1. Enhance syntax: VALUES (<source_col_name>[ , ... ] -> VALUES ({expr | DEFAULT }[ , ... ], which supports eval different exprs for different branch.
2. Support computed column and distributed execution
3. Improve performance, adjust organization of pipeline, method to execute filter, and concurrency...

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):

[dantengsky]

really enjoy reading this PR.

left some comments/suggestions, pls feel free to amend those in the subsequent PR (if necessary).

and for the 'next steps', it is also suggested to implement the VALUES (expr ..) first, since it currently seems to be the functionality most eagerly awaited by users.