Add improved graph and validation support #111
Merged
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This PR adds two related packages. First this change introduces a Gonum-based graph implementation for improved performance and easier access to advanced, well-tested graph functionality. In a future PR the implicit graph implementation in the scheduler will be replaced with this one.
Partly using this new graphing support to detect circular dependencies, this PR also adds a new validation package. It aims to replace the existing ad-hoc implementation with a more structured, and consistent API. Likewise, in a future PR the current validation will be replaced with this
validation
package.