Investigate whethere we can use number for chain_id in N-API

[Wodann]

In TS libraries such as ethers, viem, and @ethereumjs/common the chainId variable is represented as a number, whereas EDR uses BigInt.

We should investigate whether we can also use number in the ProviderConfig while maintaining strong typing for chain_id: u64

[Wodann]

The type override only changes the generated index.d.ts and doesn't actually change handling of the received type.

This issue is here for tracking by the team. If you know how to resolve the issue, you're welcome to submit an implementation that we can review. If not, we'll investigate it once we have bandwidth.