fix: make parameter group description configurable

[syphernl]

what

• This allows to set the description of a Parameter Group to prevent recreation.

why

• Before v0.41.3 no description was set, so this defaulted to Managed by Terraform. As the description cannot be changed without recreating the Parameter Group this caused issues with existing resources.

references

• Refs #142, #144

[nitrocode]

/test all