Add suppress_stderr argument to hooks

[paololazzari]

Describe the enhancement

Given that currently there is a suppress_stdout argument, it makes sense to add a suppress_stderr argument as well.
Example usage:

terraform {
  after_hook "after_hook" {
    commands     = ["plan"]
    execute      = ["./hook.sh"]
    run_on_error = true
    suppress_stdout = true
    suppress_stderr = true
  }
}

I am happy to help implement this.

RFC Not Needed

• I have evaluated the complexity of this enhancement, and I believe it does not require an RFC.