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.spec.ts

@@ -0,0 +1,24 @@
+import { getIndividualVersionsForProject, getCompositeVersionsForProject } from "./get-versions-for-project";
+import {Project} from "../project/projects";
+
+describe('getIndividialVersionsForProject', () => {
+    it('returns individual versions matrix for magento-open-source', () => {
+        expect(Object.keys(getIndividualVersionsForProject("magento-open-source")).length).toBeGreaterThan(0)
+        expect(Object.keys(getIndividualVersionsForProject("mage-os")).length).toBeGreaterThan(0)
+    })
+    
+    it('throws error if no individual versions are specified for given project', () => {
+        expect(() => getIndividualVersionsForProject(<Project>"ahsoka")).toThrowError()
+    })
+})
+
+describe('getCompositeVersionsForProject', () => {
+    it('returns composite versions matrix for magento-open-source', () => {
+        expect(Object.keys(getCompositeVersionsForProject("magento-open-source")).length).toBeGreaterThan(0)
+        expect(Object.keys(getCompositeVersionsForProject("mage-os")).length).toBeGreaterThan(0)
+    })
+
+    it('throws error if no composite versions are specified for given project', () => {
+        expect(() => getCompositeVersionsForProject(<Project>"spock")).toThrowError()
+    })
+})