cpp tablet new interface

[hongzhi-gao]

Add tsfile-cpp tablet new interface

    /**
     * @brief Constructs a Tablet object by taking pre-filled columns.
     *
     * For numeric types, `columns[col_index]` should point to a contiguous
     * array of the corresponding C++ type.
     * For string-like types (TEXT/BLOB/STRING), `columns[col_index]` should
     * point to an array of `common::String` with length `row_num`.
     */
    Tablet(uint32_t column_num, uint32_t row_num, void** columns,
           const std::vector<std::string>& column_names,
           const std::vector<common::TSDataType>& data_types);

    /**
     * @brief Set a whole column buffer at once.
     *
     * @param column_index Schema index of the column to set.
     * @param column A pointer to an array with `column_length` elements.
     *               See the constructor doc for the expected element types.
     * @param column_length Number of rows to copy from `column`.
     */
    int set_column(int column_index, void* column, int column_length);

[jt2594838]

Need to directly assign the pointer instead of a memory copy.

The method should be extremely fast but may be unsafe.

[jt2594838]

It seems that the bitmap is a null_bitmap.

[jt2594838]

Mention how cur_row_size is updated after calling this method.

[jt2594838]

How about the time column.