Add EdgeStyle new param with new features

• Added new EdgeStyle param with options for edges customization, like border-radius and like style.
• Changed PaintBuilder to EdgeStyleBuilder, paint selection is now a part of EdgeStyleBuilder.
• Changed PathBuilder to accept EdgeStyle style param as an argument.
• Edges gestures hit-box rework.

Fix complexity bug

• Fix complexity bug with node relations detection.

Remove max iterations

• Removed max node per graph limit.

Get rid of InteractiveViewer.

• Removed internal InteractiveViewer dependency. Content boundaries, scrolls or InteractiveViewer usage are now on applications responsibility.
• Removed transformationController since InteractiveViewer is no longer used.
• Removed contentWrapperBuilder since InteractiveViewer is no longer used.
• Changed onCanvasTap callback to provide tap details and trigger only if tapped out of other widgets and figures.

Major release of new functionality

• Param cellSize changed to defaultCellSize with Size type. Now it's possible to create non-square nodes. #16
• Each node input now has size param allowing defaultCellSize override for particular nodes. #15
• Node gestures know also have rect (Rect) as param, with info about node's position on Stack.
• Ability to set centered node outcomes to provide more pretty graph rendering for tree-like graphs. #2
• Ability to add overlays with overlayBuilder param.
• Ability to add edge text or Widget labels using edgeLabels param. #13
• Ability to wrap InteractiveViewer content with custom widget using contentWrapperBuilder.
• Ability to draw double-headed arrows on edges or without arrows on edges via EdgeInput.type. #4
• Added clipBehavior, transformationController as new params.
• Fixed bugs with non-firing edge gestures and increased edges hitbox to improve UX. #10 #14
• More examples.
• Many fixes and improvements for more compact graph rendering.

Bump pubspec version to 0.2.2

Fix Tag

Add on Canvas Tap param

• Added on custom painter tap gesture

Add InteractiveViewer and PathBuilder

• Ability to scale & pan graph through Interactive Widget.
• Removed ScrollDirection enum (replaced ScrollViews with Interactive Widget).
• Added ability to customize path shape with pathBuilder param.