workload: add more workload

[wk989898]

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[gemini-code-assist]

Code Review

This pull request introduces the bank4 workload, which is optimized for partition-heavy DDL stress testing with a schema that includes 126 monthly partitions. It also refactors the DDLRunner to schedule DDL tasks evenly throughout the minute, improving the consistency of the workload. Review feedback points out that the bank4 DDL generator currently only supports TRUNCATE TABLE, which limits the effectiveness of mixed DDL configurations. Additionally, a performance optimization was suggested for the INSERT statement generation to reduce memory allocations by using fmt.Fprintf instead of fmt.Sprintf inside loops.

[gemini-code-assist]

The BuildDDLSql implementation always returns a TRUNCATE TABLE statement, regardless of the DDL type intended by the scheduler (e.g., add_column, add_index). This makes the rate_per_minute configuration for other DDL types in the provided examples (like ddl_partition_table_mixed.toml) misleading, as they will all result in table truncations. Consider updating the DDLWorkload interface to include the DDL type or implementing logic to vary the DDL statement generated here.

[gemini-code-assist]

Using fmt.Sprintf inside a loop to build a large string can be inefficient due to multiple allocations. It is better to use fmt.Fprintf to write directly into the bytes.Buffer.

		fmt.Fprintf(&buf, "('%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d,'%s',%d,'%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,'%s','%s','%s','%s',%d,%d,%d)",
			col1Value, col2Value, col3Value, col4Value, col5Value, col6Value, col7Value, col8Value, col9Value, col10Value,
			col11Value, col12Value, col13Value, col14Value, col15Value, col16Value, col17Value, col18Value, col19Value, col20Value,
			col21Value, col22Value, col23Value, col24Value, col25Value, col26Value, col27Value, col28Value, col29Value, col30Value)

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