feat: add SelectFiles and add KnowledgeTesting (#60)

web/src/assets/svg/navigation-pointer.svg

web/src/assets/svg/selected-files-collapse.svg

web/src/constants/knowledge.ts

web/src/less/variable.less

...ages/add-knowledge/components/knowledge-sidebar/index.tsx

...ges/add-knowledge/components/knowledge-testing/index.less

...ages/add-knowledge/components/knowledge-testing/index.tsx

...e/components/knowledge-testing/testing-control/index.less

...ge/components/knowledge-testing/testing-control/index.tsx

...ge/components/knowledge-testing/testing-result/index.less

...dge/components/knowledge-testing/testing-result/index.tsx

...ponents/knowledge-testing/testing-result/select-files.tsx

web/src/pages/add-knowledge/constant.ts

web/src/routes.ts