feat: add project versions (#110)

* refactor: allow version matrixes by projects

* feat: add initial version-matrix for mage-os

* feat: add project as optional input to action

* docs: document new input

* refactor: tighten types a bit

* chore: apply change requests from code review

supported-version/src/versions/get-versions-for-project.ts

@@ -0,0 +1,34 @@
+import { validateProject } from "../project/validate-projects";
+import { PackageMatrixVersion } from "../matrix/matrix-type";
+
+const individual = {
+    'mage-os': require('./mage-os/individual.json'),
+    'magento-open-source': require('./magento-open-source/individual.json')
+}
+
+const composite = {
+    'mage-os': require('./mage-os/composite.json'),
+    'magento-open-source': require('./magento-open-source/composite.json')
+}
+
+export const getIndividualVersionsForProject = (project: string): Record<string, PackageMatrixVersion> => {
+    validateProject(<any>project)
+    if (individual[project] === undefined) {
+        throw new Error(
+            `Project "${project}" has no individual version specifications`
+        )
+    }
+    
+    return individual[project]
+}
+
+export const getCompositeVersionsForProject = (project: string): Record<string, PackageMatrixVersion> => {
+    validateProject(<any>project)
+    if (composite[project] === undefined) {
+        throw new Error(
+            `Project "${project}" has no composite version specifications`
+        )
+    }
+
+    return composite[project]
+}