refactor(rooch-store): rename DA block cursor constant (#2797)

Renamed DA_BLOCK_CURSOR_COLUMN_FAMILY_NAME for clarity and consistency within the codebase. This change should make the column family names more intuitive for future maintenance.

crates/rooch-store/src/lib.rs

@@ -46,7 +46,7 @@ pub const TX_ACCUMULATOR_NODE_COLUMN_FAMILY_NAME: ColumnFamilyName = "transactio
 pub const STATE_CHANGE_SET_COLUMN_FAMILY_NAME: ColumnFamilyName = "state_change_set";
 
 pub const DA_BLOCK_SUBMIT_STATE_COLUMN_FAMILY_NAME: ColumnFamilyName = "da_block_submit_state";
-pub const DA_BLOCK_CURSOR_COLUMN_FAMILY_NAME: ColumnFamilyName = "da_last_block_number";
+pub const DA_BLOCK_CURSOR_COLUMN_FAMILY_NAME: ColumnFamilyName = "da_block_cursor";
 
 ///db store use cf_name vec to init
 /// Please note that adding a column family needs to be added in vec simultaneously, remember！！