inline start transactions from pager and wal

Execute `SELECT 1`/limbo_execute_select_1
                        time:   [30.543 ns 30.585 ns 30.632 ns]

core/storage/pager.rs

@@ -240,10 +240,12 @@ impl Pager {
         (db_header.page_size - db_header.reserved_space as u16) as usize
     }
 
+    #[inline(always)]
     pub fn begin_read_tx(&self) -> Result<LimboResult> {
         self.wal.borrow_mut().begin_read_tx()
     }
 
+    #[inline(always)]
     pub fn begin_write_tx(&self) -> Result<LimboResult> {
         self.wal.borrow_mut().begin_write_tx()
     }

core/storage/wal.rs

@@ -381,6 +381,7 @@ impl Wal for WalFile {
     }
 
     /// End a read transaction.
+    #[inline(always)]
     fn end_read_tx(&self) -> Result<LimboResult> {
         tracing::debug!("end_read_tx");
         let read_lock = &mut self.get_shared().read_locks[self.max_frame_read_lock_index];