feat: display all pdf pages and add DocumentPreview (#88)

web/.umirc.ts

web/package-lock.json

web/package.json

web/src/constants/knowledge.ts

web/src/hooks/knowledgeHook.ts

...ents/knowledge-chunk/components/document-preview/hooks.ts

...ts/knowledge-chunk/components/document-preview/index.less

...nts/knowledge-chunk/components/document-preview/index.tsx

...c/pages/add-knowledge/components/knowledge-chunk/hooks.ts

...pages/add-knowledge/components/knowledge-chunk/index.less

.../pages/add-knowledge/components/knowledge-chunk/index.tsx

...c/pages/add-knowledge/components/knowledge-chunk/model.ts

...rc/pages/add-knowledge/components/knowledge-file/model.ts

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

web/src/services/kbService.ts

web/src/utils/api.ts

web/src/utils/request.ts