Reduce duplicated data and memory consuption by adding copy on writeopts dictionary

Problem:When pyobjects renderer set grains/pillar on an OptsDict child, siblingchildren (other loaders) couldn't see those values. Siblings only seeparent _local dicts, not each other's _local dicts.Root Cause:In OptsDict, when child A sets opts["grains"], it goes into A's _local.When sibling child B tries to access opts["grains"], it walks up theparent chain checking _local dicts, but never finds A's _local becausethey're siblings.Fix:1. Added OptsDict.get_root() to find the root instance2. Added OptsDict.set_shared(key, value) to set values on root so   all children can see them3. Modified pyobjects renderer to use set_shared() for grains/pillarThis ensures shared configuration values are visible to all loaders.Fixes:- Unit test failures: test_pyobjects.py (NameError: name 'Pkg' not defined)- Functional test failures: state file discovery and execution- All related to config visibility between loaders