Add sshdconfig set for "regular" keywords & clobber = true

[tgauth]

PR Summary

• note: to minimize PR size this is only intended to support: clobber: true and regular keyword (no objects/arrays yet)
• general flow of set command: create temp file based on input, validate temp file using sshd -T, back-up any existing sshd_config file (only if it is not already managed by this resource), then update/create sshd_config file
• add Pester tests