Core - updates to support latest changes in LangChain and TypeScript-ESLint

[pranav-kural]

There are some issues in updating to the latest releases of LangChain and TypeScript-ESLint.

LangChain (0.2.9 to 0.2.12) #64

 Type 'MemoryVectorStore' is not assignable to type 'VectorStore'.
    Types of property 'similaritySearch' are incompatible.
      Type '(query: string, k?: number | undefined, filter?: ((doc: Document<Record<string, any>>) => boolean) | undefined, _callbacks?: Callbacks | undefined) => Promise<...>' is not assignable to type '(query: string, k?: number | undefined, filter?: string | object | undefined, _callbacks?: Callbacks | undefined) => Promise<DocumentInterface<Record<string, any>>[]>'.

TypeScript ESLint (7.18.0 to 8.0.0) #65

/home/runner/work/qvikchat/qvikchat/src/cache/in-memory-cache-store.ts
Error:   161:7  error  Expected an assignment or function call and instead saw an expression  @typescript-eslint/no-unused-expressions

/home/runner/work/qvikchat/qvikchat/src/endpoints/endpoints.ts
Error:   317:18  error  'error' is defined but never used  @typescript-eslint/no-unused-vars

/home/runner/work/qvikchat/qvikchat/src/utils/utils.ts
Error:   51:[12](https://github.com/oconva/qvikchat/actions/runs/10200824958/job/28221262173?pr=65#step:6:13)  error  'e' is defined but never used  @typescript-eslint/no-unused-vars

✖ 4 problems (4 errors, 0 warnings)

Error: Process completed with exit code 1.