disk offering updates

[poddm]

Description

This pull request extends the CloudStack Terraform Provider's cloudstack_disk_offering resource with comprehensive support for additional disk offering configuration options.

Changes

Enhanced Disk Offering Resource Schema

The cloudstack_disk_offering resource has been significantly expanded to support the following new configuration parameters:

Performance & I/O Settings:

• cache_mode - Disk caching mode configuration
• iops_read_rate - Read I/O operations per second
• iops_read_rate_max - Maximum read I/O operations per second
• iops_read_rate_max_length - Read rate burst length
• iops_write_rate - Write I/O operations per second
• iops_write_rate_max - Maximum write I/O operations per second
• iops_write_rate_max_length - Write rate burst length

Configuration & Scoping:

• disk_offering_strictness - Enforce strict disk sizing
• domain_id - Associated domain IDs (list support)
• zone_id - Associated zone IDs (list support)
• provisioning_type - Disk provisioning type
• storage_type - Storage backend type
• tags - Resource tags for organization

Nested Configurations:

• hypervisor block - Hypervisor-specific I/O rate limits (bytes_read_rate, bytes_write_rate, etc.)
• storage block - Storage tier configuration (min/max IOPS, customized IOPS flag, hypervisor snapshot reserve)

Implementation Updates

• Updated resource creation logic to handle optional parameters with proper conditional setting
• Support for flexible disk sizing with customization options
• Enhanced parameter handling for complex nested configurations
• Improved support for domain and zone scoping