Allow table reuse in multi-chunker

[Kiran01bm]

Example below:

ζ ./spirit --host="127.0.0.1:8033" --username="tsandbox" --password="msandbox" \                                                                                                                                                         
  --database="test_spirit" \
  --statement="ALTER TABLE json_table ADD COLUMN price DECIMAL(10,2) GENERATED ALWAYS AS (JSON_EXTRACT(metadata, '$.price')), ADD INDEX idx_price_category ((JSON_EXTRACT(metadata, '$.category'), JSON_EXTRACT(metadata, '$.price')))"
spirit: error: could not parse SQL statement: ALTER TABLE json_table ADD COLUMN price DECIMAL(10,2) GENERATED ALWAYS AS (JSON_EXTRACT(metadata, '$.price')), ADD INDEX idx_price_category ((JSON_EXTRACT(metadata, '$.category'), JSON_EXTRACT(metadata, '$.price')))

[morgo]

I've renamed the description based on what we discussed - we should allow table re-use in the multi-chunker. Getting around this limitation is one reason, but there are other benefits, such as merging naive DDL statements.