refactor: replace mjs vectordb files by ts files (#36)

helpers/typescript.ts

templates/components/engines/typescript/agent/chat.ts

templates/components/loaders/typescript/file/loader.ts

...lates/components/loaders/typescript/llama_parse/loader.ts

templates/components/vectordbs/typescript/astra/generate.ts

templates/components/vectordbs/typescript/astra/index.ts

templates/components/vectordbs/typescript/astra/shared.ts

templates/components/vectordbs/typescript/milvus/generate.ts

templates/components/vectordbs/typescript/milvus/index.ts

templates/components/vectordbs/typescript/milvus/shared.ts

templates/components/vectordbs/typescript/mongo/generate.ts

templates/components/vectordbs/typescript/mongo/index.ts

templates/components/vectordbs/typescript/mongo/shared.ts

templates/components/vectordbs/typescript/none/generate.ts

templates/components/vectordbs/typescript/none/index.ts

templates/components/vectordbs/typescript/none/shared.ts

templates/components/vectordbs/typescript/pg/generate.ts

templates/components/vectordbs/typescript/pg/index.ts

templates/components/vectordbs/typescript/pg/shared.ts

...ates/components/vectordbs/typescript/pinecone/generate.ts