[WIP] Implement CircuitGraph and IRLookup to firrtl.analyses (#1603)

* WIP Commit

* Add EdgeDataDiGraph with views to amortize graph construction

* WIP, got basic structure, need tests to pipeclean

* First tests pass. Need more.

* Tests pass, more need to be written

* More tests pass! Things should work, except for memories

* Added clearPrev to fix digraph uses where caching prev breaks

* Removed old Component. Documented IRLookup

* Added comments. Make prev arg to getEdges

* WIP: Refactoring for CircuitGraph

* Refactored into CircuitGraph. Can do topological module analysis

* Removed old versions

* Added support for memories

* Added cached test

* More stufffff

* Added implicit caching of connectivity

* Added tests for IRLookup, and others

* Many major changes.

Replaced CircuitGraph as ConnectionGraph
Added CircuitGraph to be top-level user-facing object
ConnectionGraph now automatically shortcuts getEdges
ConnectionGraph overwrites BFS as PriorityBFS
Added leafModule to Target
Added lookup by kind to IRLookup
Added more tests

* Reordered stuff in ConnectionGraph

* Made path work with deep hierarchies. Added PML for IllegalClockCrossings

* Made pathsInDAG work with current shortcut semantics

* Bugfix: check pathless targets when shortcutting paths

* Added documentation/licenses

* Removed UnnamedToken and related functionality

* Added documentation of ConnectionGraph

* Added back topo, needed for correct solving of intermediate modules

* Bugfix. Cache intermediate clockSources from same BFS with same root, but not BFS with different root

* Added literal/invalid clock source, and unknown top for getclocksource

* Bugfix for clocks in bundles

* Add CompleteTargetSerializer and test

* remove ClockFinder, be able to compile.

* test is able to compile, but need to fix.

* public and abstract DiGraph, remove DiGraphLike.

* revert some DiGraph code, ConnectionGraphSpec passed.

* CircuitGraphSpec passed.

* minimize diff between master

* codes clean up

* override linearize and revert DiGraph

* keep DiGraph unchanged.

* make ci happy again.

* codes clean up.

* bug fix for rebase

* remove wir

* make scaladoc happy again.

* update for review.

* add some documentation.

* remove tag

* wip IRLookup

* code clean up and add some doucmentations.

* IRLookup cache with ModuleTarget guarded.

* make unidoc and 2.13 happy

Co-authored-by: Adam Izraelevitz <azidar@gmail.com>
Co-authored-by: Albert Magyar <albert.magyar@gmail.com>
Co-authored-by: Jack Koenig <koenig@sifive.com>

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