Add async generator get_all_workzones to AsyncOFSC

[btoron]

User Story

As a developer using AsyncOFSC, I want to iterate over all workzones lazily so that I can process large datasets without loading everything into memory.

Description

Add a new async generator function get_all_workzones to the AsyncOFSMetadata class that yields individual Workzone objects one by one, fetching pages on demand.

Requirements

• Add get_all_workzones(limit: int = 100) -> AsyncGenerator[Workzone, None] method
• Use true Python async generator with yield (lazy evaluation)
• Reuse existing get_workzones() internally for consistent error handling
• Add import: from collections.abc import AsyncGenerator
• Add comprehensive tests

Implementation

async def get_all_workzones(
    self,
    limit: int = 100
) -> AsyncGenerator[Workzone, None]:
    """Async generator that yields all workzones one by one."""
    offset = 0
    has_more = True

    while has_more:
        response = await self.get_workzones(offset=offset, limit=limit)
        for workzone in response.items:
            yield workzone
        has_more = response.hasMore or False
        offset += len(response.items)
        if len(response.items) == 0:
            break

Usage Example

async with AsyncOFSC(...) as client:
    async for workzone in client.metadata.get_all_workzones():
        print(workzone.workZoneLabel)

    # Or collect all into a list
    all_workzones = [wz async for wz in client.metadata.get_all_workzones()]

Files to Modify

• ofsc/async_client/metadata.py - Add method and import
• tests/async/test_async_workzones.py - Add test class TestAsyncGetAllWorkzones

Test Cases

1. test_get_all_workzones_returns_async_generator - Verify return type
2. test_get_all_workzones_yields_workzone_instances - Verify yielded items
3. test_get_all_workzones_fetches_all - Verify pagination works
4. test_get_all_workzones_unique_labels - Verify no duplicates

Acceptance Criteria

• Function yields individual Workzone objects (not pages)
• Pagination is handled automatically
• Errors propagate immediately (fail-fast)
• All tests pass
• Code verified with ruff