`NoNullValues` validator for list and set types

[jar-b]

Terraform CLI and Framework Versions

% terraform version
Terraform v1.9.5
on darwin_arm64

% cat go.mod | rg terraform-plugin-framework
        github.com/hashicorp/terraform-plugin-framework v1.13.0
        github.com/hashicorp/terraform-plugin-framework-jsontypes v0.2.0
        github.com/hashicorp/terraform-plugin-framework-timeouts v0.4.1
        github.com/hashicorp/terraform-plugin-framework-timetypes v0.5.0
        github.com/hashicorp/terraform-plugin-framework-validators v0.15.0

Use Cases or Problem Statement

The AWS provider recently implemented a bug fix which included a custom set validator to check for null values. In our use case null values could not be used with the underlying AWS API, and therefore should be surfaced as errors as early as possible. A similar validator could be implemented for list types.

Similar to #231, I'm not sure if this use case is a common enough to warrant moving up into this repository but again thought I'd offer up our implementation in case.

Proposal

Add a new NoNullValues validator to the setvalidator and listvalidator packages.

I derived the name from the UniqueValues list validator, but am open to any suggestions.

Additional Information

Relates hashicorp/terraform-provider-aws#40076

Code of Conduct

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