Upgrade terraform-plugin-framework to v0.16.0

[boxofrad]

Description

This PR upgrades the terraform-plugin-framework dependency from v0.10.0 to v0.16.0.

There was a fairly major change to the types package in v0.16.0, in which they made the majority of values immutable, and the Value, Null, and Unknown fields unexported.

This is particularly awkward for our generated Copy*ToTerraform methods which would previously mutate the given object's attributes directly, but now need to construct new objects.

User-facing changes

Copy*ToTerraform method signature

Before:

func CopyTestToTerraform(ctx context.Context, obj *Test, tf *types.Object) diag.Diagnostics {

After:

func CopyTestToTerraform(ctx context.Context, obj *Test, curr *types.Object) (types.Object, diag.Diagnostics) {

Custom type CopyTo* method signature

Before:

func CopyToStringCustom(diags diag.Diagnostics, obj string, t attr.Type, v attr.Value) attr.Value {

After:

func CopyToStringCustom(diags diag.Diagnostics, obj string) attr.Value {

Configuration changes

The time_type and duration_type stanzas now require three new options:

• value_from_method - the method that will be called on an attr.Value to get the value for the protobuf struct
• value_to_method - the (package-qualified) method that will be called to construct an attr.Value from the protobuf struct value
• null_value_method - the (package-qualified) method that will be called to construct a null attr.Value

The injected_fields stanzas now require a value_method option, which is the (package-qualified) method that will be called to construct the value of the injected field, when it is not already set.

[hugoShaka]

Todo for me later:

• fix the ValueCastFromType in Override
• write a test for the override or deprecate it?! It looks like it has been broken since forever.