Retrieve SEL in both opinionated and raw formats

[mattcburns]

What does this PR implement/change/remove?

This PR adds the ability to retrieve the System Event Log from the target BMC using either IPMI or Redfish. There is an opinionated method that returns the entries as an array of entries in array format and a raw method that returns the raw output from the BMC.

Checklist

• Tests added
• Similar commits squashed

The HW vendor this change applies to (if applicable)

N/A

The HW model number, product name this change applies to (if applicable)

N/A

The BMC firmware and/or BIOS versions that this change applies to (if applicable)

N/A

What version of tooling - vendor specific or opensource does this change depend on (if applicable)

N/A

Description for changelog/release notes

Added GetSystemEventLog and GetSystemEventLogRaw. These methods retrieve the SEL of the target BMC. The former uses an opinionated format, retrieving the ID, Timestamp, Description, Message in an array format. The latter returns the raw output as a string. Both IPMI and Redfish are supported.

[codecov]

Codecov Report

Attention: 73 lines in your changes are missing coverage. Please review.

Comparison is base (0df7b75) 43.87% compared to head (6659f34) 43.93%.

Files	Patch %	Lines
internal/redfishwrapper/sel.go	0.00%	43 Missing ⚠️
bmc/sel.go	76.62%	15 Missing and 3 partials ⚠️
client.go	0.00%	8 Missing ⚠️
providers/ipmitool/ipmitool.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #375      +/-   ##
==========================================
+ Coverage   43.87%   43.93%   +0.06%     
==========================================
  Files          59       59              
  Lines        5042     5178     +136     
==========================================
+ Hits         2212     2275      +63     
- Misses       2608     2678      +70     
- Partials      222      225       +3     

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