Add new generator - character

[merddyin]

Add new base generator and associated tests
Name: character
Purpose: Generates a single symbol, number, or alpha character in either upper or lower case. Will be used by a planned new generator for creation of complex passwords.

[merddyin]

Additional notes:
Generator has no supplemental data file dependencies
Associated tests cover all available parameters and value combinations (13 tests, with 13 of 13 passing locally)
Tests have been run in both PowerShell 7.3.3 and Windows PowerShell 5.1 on Windows 11

[dfinke]

TBH, not sure when I'll be able to get to this. Between new stuff and tests its >300 loc.

Plus, I need to re-orient myself on the functionality in the psm1.

[merddyin]

Understood, though I'd point out that, if you take out all the comments (including the comment-based help), the actual function is barely 100 lines in total...less if you also dump the five Write-Verbose lines. From a tests perspective, I modeled mine after your own tests, though I did add tests for return type that your tests don't currently have. I picked this as the first PR because it was simple...it returns a single item, doesn't depend on other generators, and doesn't have any advanced output.

I guess, just let me know when you are ready to dig in.