clients/js: Refactor all `Reflect` into normal typescript code

[lukaw3d]

I think the only reason for Reflect was that typescript did not complain about wrong types

[Boopi7]

Hello, Team!
Hope you are well!
I am Stefan in Australia from discord
I have sent my CV and github by dm.
My discord id is cubix
I have tried to solve this issue

so i have done these:

1. replaced Reflect calls in `clients/js/src/provider.ts
2. Replaced Reflect calls in integrations/viem-v2/src/index.ts
3. All unit tests pass (same as CI)
4. TypeScript compiles with no errors
5. All linting passes

please check
looking forward to your reply
best