feat: Add --select flag suport to list group-members

[mistahj67]

Description

Part 2 of BED-4586
Closes #69
Closes #64

Adds --select as a flag for the list group-members command

Defaults the $select param to the following if the flag is not present:

• odata.type
• id
• displayName
• createdDateTime

Ensure an escape hatch for --select="" in order to return Azure default entity properties
Support custom --select properties as a comma delimited list as well ex: --select="id,assignedPlans,email"

Cleaned up some duplicate logic as well

Motivation and Context

Decrease file size by defaulting to a property list that will keep file sizes low but ensure there's still an ability to pull any / all properties for group members.

This should address concerns from #69
This was inspired by the efforts of @malac and PR #64

How Has This Been Tested?

Ran locally in azurehound directory after go build

• ./azurehound list group-members --json -o path/to/output.json --select=""
  • Should show full output
• ./azurehound list group-members --json -o path/to/output.json
  • Should show the above default properties
• ./azurehound list group-members --json -o path/to/output.json --select="id,assignedPlans,email"
  • Should show the id, assignedPlans, email (and odata.type b/c that's required)

Also ingested into Bloodhound Enterprise and verified no apparent errors with analysis.

Updated unit tests

Types of changes

• Chore (a change that does not modify the application functionality)
• Is a breaking as default group members output will be limited to the default above
• Refactor

Checklist:

• I have met the contributing prerequisites
  • Assigned myself to this PR
  • Added the appropriate labels
• I have followed proper test practices
  • Added/updated tests to cover my changes
  • All new and existing tests passed