Add a resource for fine-grained management of named ports

[rileykarson]

Fixes hashicorp/terraform-provider-google#1480

Release Note Template for Downstream PRs (will be copied)

`google_compute_instance_group_named_port`

[rileykarson]

The patchencoder for the fine-grained resource deep-compared the returned value, including the type. Terraform stores TypeInt as int, so we need to return that to compare properly. Before, we passed the value onto TF core where it did the conversion.

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 59 files changed, 2086 insertions(+), 300 deletions(-))
Terraform Beta: Diff ( 70 files changed, 2788 insertions(+), 456 deletions(-))
TF Conversion: Diff ( 1 file changed, 69 insertions(+))
TF OiCS: Diff ( 4 files changed, 134 insertions(+))

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 60 files changed, 2165 insertions(+), 300 deletions(-))
Terraform Beta: Diff ( 71 files changed, 2867 insertions(+), 456 deletions(-))
TF Conversion: Diff ( 1 file changed, 69 insertions(+))
TF OiCS: Diff ( 4 files changed, 134 insertions(+))

[emilymye]

Does it make sense to have the validator resource?

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 61 files changed, 2339 insertions(+), 330 deletions(-))
Terraform Beta: Diff ( 72 files changed, 3059 insertions(+), 490 deletions(-))
TF Conversion: Diff ( 1 file changed, 78 insertions(+))
TF OiCS: Diff ( 4 files changed, 142 insertions(+))

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 62 files changed, 2348 insertions(+), 332 deletions(-))
Terraform Beta: Diff ( 72 files changed, 3059 insertions(+), 490 deletions(-))
TF Conversion: Diff ( 1 file changed, 78 insertions(+))
TF OiCS: Diff ( 4 files changed, 142 insertions(+))