fix: correct CKBRPC.createBatchRequest() types

[twhy]

Description

This PR aims to correct CKBRPC.createBatchRequest() types.

// Before
createBatchRequest: <N extends keyof Base, P extends (string | number | object)[], R = any[]>(params?: any) => any;

// After
createBatchRequest: <N extends keyof Base, P extends (string | number | object)[], R = any[]>(params?: [method: N, ...rest: P][]) => [method: N, ...rest: P][] & {
    add: (n: N, ...p: P) => [method: N, ...rest: P][];
    remove: (index: number) => [method: N, ...rest: P][];
    exec: () => Promise<R>;
};

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

$ npx pnpm build
$ npx pnpm test

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[homura]

Hi, can you add a changeset for @ckb-lumos/rpc for this PR?

npx changeset add

[homura]

Hi, can you add a changeset for @ckb-lumos/rpc for this PR?

npx changeset add

[twhy]

Hi, can you add a changeset for @ckb-lumos/rpc for this PR?

npx changeset add

Added.