Agent Availability Report enhancements

For state management, there're two fields in the database table Agent_MRD_State_Events that are used to identify the agent current state.

1. State
2. Mode - 0 (pending-not-ready), 1 (any of the agent state as mentioned in schema doc)
   See the table scheme on Schema Enhancements confluence page.

Improvement is needed in calculating duration for the following columns.

1. Active Duration - include the following rule as well
   1. State:ACTIVE, Mode:1 -> State:Active, Mode: 0
2. Busy Duration - include the following rule as well
   1. State: BUSY, Mode: 1 -> State: BUSY, Mode: 0
   2. State: BUSY, Mode: 1 -> State: Active, Mode: 1
3. Pending Not Ready - include the following rules
   1. State: ACTIVE, Mode: 0 -> State: ACTIVE, Mode: 1
   2. State: BUSY, Mode: 0 -> State: BUSY, Mode: 1
   3. State: BUSY, Mode: 0 -> State: Active, Mode: 0
   4. State: ACTIVE, Mode: 0 -> State: NOT_READY, Mode: 0