feat: add ListSnapshots RPC

[Praveen005]

This PR implements the ListSnapshots RPC method as part of the CSI Driver's Snapshot & Restore functionality. It handle various cases for listing snapshots,

Case 1: Fetch by Snapshot ID

1. Retrieves a specific snapshot by its ID.
2. If the snapshot is not found(a successful search), returns an empty response instead of an error.

if strings.Contains(err.Error(), "DatabaseSnapshotNotFoundError") {
	return &csi.ListSnapshotsResponse{}, nil
}

3. Returns an error only when, it encounters an internal error while retrieving the snapshot.

return nil, status.Errorf(codes.Internal, "failed to list snapshot %v: %v", snapshotID, err)

Case 2: Fetch by Source Volume ID

1. Lists snapshots associated with a specific source volume.

Case 3: Fetch All Snapshots

1. Retrieves all snapshots if no specific filters (snapshot ID or source volume ID) are provided.

The results are sorted and returned.
Reason: To make the order deterministic

Note: for now I have commented out some parts of the code, as it requires some implementations on the client side.

[hlts2]

Thank you for the PR 👍
I think it is good overall!
I have made a few comments, please check them out. 🙏

[hlts2]

Thank you! LGTM! 👍

[hlts2]

@Praveen005
I approved this PR 👍
I will merge this PR after all CI have passed 🚀