Sanal

Add generic snapshot context and data structure. Add callbacks for listener as discussed. Use nuraft read and write logical snapshot callbacks to transfer the data. Do test on both read...

For long running add multiple chunk test with random chunk and data size Also randomize the number of insertions along with truncations.

1. Find the area's in journal vdev where we need crash recovery points. 2. Implmenet those flip points.

1. Implement changes for the baseline resync. Wont support restart and follower always start from the beginning. 2. Add UT's to test adding new members.

Triage crash recovery issue: sb updates while new root buffer fails

1

Triage sigsegv in mehdi's PR

Variable length keys UT's fails on github actions. But works on local build machines.