Add Copy support for resources

[SteveL-MSFT]

PR Summary

Add copy support for resources. This PR does not include copy support for variables nor properties which will come later. The mode and batchSize properties for copy are not supported.

Symbolic names aren't supported, that'll be added as part of ARM Language 2.0 work

PR Context

Fix #496

[Copilot]

Pull Request Overview

This PR adds copy support for resources to enable looping functionality in DSC configurations. It introduces a new copyIndex() function that can be used within copy loops to generate dynamic resource names and properties based on the current iteration index.

• Introduces copy loop functionality for resources with unrolling during configuration validation
• Adds the copyIndex() function for accessing loop indices with support for offsets and named loops
• Restricts usage of reference() function within copy loops to prevent invalid state dependencies

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
dsc_lib/src/functions/reference.rs	Prevents reference() function usage in copy mode
dsc_lib/src/functions/mod.rs	Registers the new copyIndex function
dsc_lib/src/functions/copy_index.rs	Implements the copyIndex() function with loop index access
dsc_lib/src/configure/mod.rs	Adds copy loop unrolling logic during configuration validation
dsc_lib/src/configure/context.rs	Extends context with copy-related state tracking
dsc_lib/src/configure/config_doc.rs	Changes copy count and batch size fields from i32 to i64
dsc_lib/locales/en-us.toml	Adds localized error messages for copy functionality
dsc/tests/dsc_copy.tests.ps1	Comprehensive test coverage for copy loop functionality

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