Additional Disk Management options.

I would like to request the following options be reviewed and added to Unraid.

1) Allow power management of SSDs(Spindown) for power savings.

2) Allow power management of NVMEs via nvme-cli for power savings*

3) Reduce spindown attempts on devices that don't support spindown.

4) Allow setting spindown timer for Unassigned Devices.

*Started looking to NVME but only have one device to review, currently looks like my machine is set to PS = 3 

subnqn  : 
ps    0 : mp:3.50W operational enlat:0 exlat:0 rrt:0 rrl:0
          rwt:0 rwl:0 idle_power:- active_power:-
ps    1 : mp:1.90W operational enlat:0 exlat:0 rrt:1 rrl:1
          rwt:1 rwl:1 idle_power:- active_power:-
ps    2 : mp:1.50W operational enlat:0 exlat:0 rrt:2 rrl:2
          rwt:2 rwl:2 idle_power:- active_power:-
ps    3 : mp:0.0700W non-operational enlat:5000 exlat:1900 rrt:3 rrl:3
          rwt:3 rwl:3 idle_power:- active_power:-
ps    4 : mp:0.0020W non-operational enlat:13000 exlat:100000 rrt:4 rrl:4
          rwt:4 rwl:4 idle_power:- active_power:-
root@computenode:/usr/src# nvme get-feature  /dev/nvme0n1 -f 2
get-feature:0x2 (Power Management), Current value:0x000003
root@computenode:/usr/src# smartctl -n standby -c  /dev/nvme0 
smartctl 7.3 2022-02-28 r5338 [x86_64-linux-5.18.14-Unraid] (local build)
Copyright (C) 2002-22, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Firmware Updates (0x12):            1 Slot, no Reset required
Optional Admin Commands (0x0017):   Security Format Frmw_DL Self_Test
Optional NVM Commands (0x005e):     Wr_Unc DS_Mngmt Wr_Zero Sav/Sel_Feat Timestmp
Log Page Attributes (0x0e):         Cmd_Eff_Lg Ext_Get_Lg Telmtry_Lg
Maximum Data Transfer Size:         64 Pages
Warning  Comp. Temp. Threshold:     70 Celsius
Critical Comp. Temp. Threshold:     85 Celsius

Supported Power States
St Op     Max   Active     Idle   RL RT WL WT  Ent_Lat  Ex_Lat
 0 +     3.50W       -        -    0  0  0  0        0       0
 1 +     1.90W       -        -    1  1  1  1        0       0
 2 +     1.50W       -        -    2  2  2  2        0       0
 3 -   0.0700W       -        -    3  3  3  3     5000    1900
 4 -   0.0020W       -        -    4  4  4  4    13000  100000

Supported LBA Sizes (NSID 0x1)
Id Fmt  Data  Metadt  Rel_Perf
 0 +     512       0         1
 1 -    4096       0         0

root@computenode:/usr/src#