[Feature]: `corefunc_json_encode_format`

[skyzyx]

What functionality would you like to see?

Will need to experiment to see if we can accept a list or map, or if we need to separate their inputs/implementations.

data "corefunc_json_encode_format" "formatted" {
  map    = {hello="world"}
  prefix = ""
  indent = "  "
}
#=> {
#     "hello": "world"
#   }

• Add jsonindent function hashicorp/terraform#31419
• https://pkg.go.dev/github.com/goccy/go-json#MarshalIndent
• https://developer.hashicorp.com/terraform/language/functions/jsonencode
• https://pkg.go.dev/github.com/hashicorp/terraform-plugin-framework/types/basetypes#ObjectValue