Fix invalid duration "": Use default for null

[skirsten]

Reproduce

"timeouts": timeouts.AttributesAll(ctx),

timeouts = {
  create = "60s"
}

on next delete/read/update:

Error: Timeout Cannot Be Parsed
  timeout for "read" cannot be parsed, time: invalid duration ""

[bendbennett]

Hi @skirsten 👋

Thank you for your contribution and sorry you ran into trouble here.

The changes look good.

Could I ask you to add test coverage for each of the Create, Read, Update and Delete functions on resource timeouts and for Read on datasource timeouts?

For example:

		"read-null": {
			timeoutsValue: timeouts.Value{
				Object: types.ObjectValueMust(
					map[string]attr.Type{
						"read": types.StringType,
					},
					map[string]attr.Value{
						"read": types.StringNull(),
					},
				),
			},
			expectedTimeout: 20 * time.Minute,
		},
		"read-unknown": {
			timeoutsValue: timeouts.Value{
				Object: types.ObjectValueMust(
					map[string]attr.Type{
						"read": types.StringType,
					},
					map[string]attr.Value{
						"read": types.StringUnknown(),
					},
				),
			},
			expectedTimeout: 20 * time.Minute,
		},

Could you also add 2 changelog entries using Changie which we are now using for changelog and version management.

Once Changie is installed can you run the following:

changie new
? Kind: BUG FIXES
Body: datasource/timeouts: Use default for null and unknown ([#35](https://github.com/hashicorp/terraform-plugin-framework-timeouts/pull/35)).
Issue/PR Number: 35

changie new
? Kind: BUG FIXES
Body: resource/timeouts: Use default for null and unknown ([#35](https://github.com/hashicorp/terraform-plugin-framework-timeouts/pull/35)).
Issue/PR Number: 35

[skirsten]

Thanks for the review.
I added the tests and updated the changelog. Can you please take a look again?

[bendbennett]

LGTM 👍

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