Cells sequences: Management, and monitoring

Problem statement:

With the current logic to allocate sequences for each cell, ideally we will not run out of sequences but it's good to have the sequences data of each table exported so that we re-use idle sequences in future cells.

Needs

1. Since the legacy cell's sequence range is not updated, we have to monitor that it's not approaching the minval of another cell.
2. We will loose this info if there the cells are getting decommisioned or it shuts down for some reason.
3. We ideally want to allocate a minimum smaller range possible and increase the sequence limit on demand (for non-legacy cells). Especially for test cells, we don't want to allocate the same range as for real cells.

Deliverables:

• Add monitoring layer for cells and add sequence related info (minval, currentval, maxval) at a regular interval.
• Add alerting when legacy cell currentval approaches minval of another cell