Support highlighting for Terraform value modifications

[marshall7m]

Hello,

It would be great if there was support for diff highlighting modified values within terraform plans.

For example something like:

Original:

Changes to Outputs:
  ~ foo = "old" -> "new"

You can apply this plan to save these new output values to the Terraform state, without changing any real infrastructure.

to something like:

Changes to Outputs:
!   foo = "old" -> "new"

You can apply this plan to save these new output values to the Terraform state, without changing any real infrastructure.