Implement InstanceTarget Behavior for Dedup + EliminateTargetPaths (#1539)

- RenameMap Behavior
-- Prevent transitive renaming A -> B -> C (continueRenaming)
-- Prevent transitive renaming for self-renames

- Target
-- Override toString as serialize for CompleteTarget
-- Expansion of stripHierarchy to enable stripping InstanceTargets to become ModuleTargets
Annotations
-- Bugfix in extractComponents where Products were not iterated over
-- Converts renamed targets to local targets using Target.referringModule to preserve sticky behavior

- Eliminate Target Paths
-- Make DuplicationHelper use LinkedHashMap, as we iterate over its contents and convert to Seq in def makePathless
-- Add DupedResult to map original module to new module targets
-- Update renaming to record a map from all relative instance paths to original module, to new module target
-- Consumes DedupedResult to give better name to new duplicated module if it was originally deduplicated
-- Reorder modules in attempt to preserve original ordering, pre-deduplication
-- Move utility functions to object
-- Bugfix: add self-renames to prevent ofModule _ of target _ cannot be renamed to Vector(_, _, _, ...) errors

- Dedup
-- Changed NoDedupAnnotation to contain ModuleTarget, rather than ModuleName
-- Added DedupedResult to map original module to the duplicate module
-- Consumes DupedResult to pick better name, if it existed
-- Updates renaming to chain the following: instancify deduped modules, remap differently named internal signals, then remap AST modules
-- Move utility functions to object
-- Remove annotations as part of determination of dedup correctness
-- Bugfix: add instance renames so that deduped modules have their instances properly renamed

- Dead Code Elimination
-- Add deletion of ASTModules

- Tests
-- Morphism Spec to ensure Dedup -> EliminateTargetPaths and EliminateTargetPaths -> Dedup patterns work properly
-- Update existing tests to make sure they work properly
-- Add Dedup tests to demonstrate instance renaming bug, EliminateTargetPaths for ofModule rename bug, and update RenameMap tests

Co-authored-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>
Co-authored-by: Adam Izraelevitz <adam.izraelevitz@sifive.com>
Co-authored-by: Adam Izraelevitz <azidar@gmail.com>
Co-authored-by: Jack Koenig <koenig@sifive.com>

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