feat(storage): implement lifecycle transitions

[sosheskaz]

Adds storage class transition lifecycle rule configuration options for both current and noncurrent objects.

[Copilot]

Pull Request Overview

This PR implements lifecycle transitions for object storage buckets by adding support for transitioning objects between storage classes. The implementation includes schema definitions, API integration, validation, and comprehensive test coverage.

Key changes:

• Add transition block support to lifecycle rules with date/days/storage_class fields
• Integrate validation for transition timing and storage class parameters
• Include test coverage for transition-only lifecycle rules

Reviewed Changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 2 comments.

File	Description
go.mod	Adds terraform-plugin-framework-validators dependency for input validation
examples/resources/coreweave_object_storage_bucket_versioning/resource.tf	Removes trailing whitespace from example
coreweave/object_storage/resource_bucket_lifecycle_configuration_test.go	Adds test case for transition-only lifecycle rules
coreweave/object_storage/resource_bucket_lifecycle_configuration.go	Implements transition schema, validation, API integration, and state management

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