Add GetBootDeviceOverride support for redfish

[coffeefreak101]

What does this PR implement/change/remove?

Adds a method to the client for getting boot device override settings.

The information returned includes:

• If the override is persistent
• If the override mode is UEFI
• The override device

The output was designed to be similar to the parameters of the BootDeviceSet method.

Checklist

• Tests added
• Similar commits squashed

The HW vendor this change applies to (if applicable)

Redfish APIs

[codecov]

Codecov Report

Attention: 41 lines in your changes are missing coverage. Please review.

Comparison is base (6c585e6) 44.40% compared to head (b145fcb) 44.60%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
internal/redfishwrapper/boot_device.go	0.00%	33 Missing ⚠️
client.go	0.00%	6 Missing ⚠️
providers/redfish/redfish.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #367      +/-   ##
==========================================
+ Coverage   44.40%   44.60%   +0.20%     
==========================================
  Files          61       61              
  Lines        5155     5201      +46     
==========================================
+ Hits         2289     2320      +31     
- Misses       2610     2625      +15     
  Partials      256      256              

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[joelrebel]

Thanks for this, apart from a few suggestions - it looks good.