Fix batch scheduler id

[LeTamanoir]

When using multiple clients initialised with http(undefined, { batch: true }) with an undefined url parameter (which internally defaults to the chain default RPC url) they would all share the same scheduler cache, sending requests to the wrongs RPCs when batched with e.g. Promise.all

cc: @0xpanoramix

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PR-Codex overview

This PR fixes the batch scheduler ID in the HTTP transport module.

Detailed summary

• Fixed batch scheduler ID in http.ts module
• Updated the id assignment from ${url} to url_

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