Fiddle: add blockNumber to EthClient.multicall

[krishan711]

Description

Screenshots:

Checklist:

• I have updated the CHANGELOG with a summary of my changes

[Copilot]

Pull request overview

This PR extends the EthClient multicall API to support historical reads by allowing callers to specify a blockNumber, ensuring multicall results can be fetched at a specific block height.

Changes:

• Add optional blockNumber parameter to EthClientInterface.multicall and forward it through both fallback per-call execution and the Multicall3 aggregate call.
• Refine Web3EthClient.get_log_entries to build FilterParams conditionally (omitting None fields) and improve typing.
• Apply small lint/style adjustments in utilities/exceptions and record the multicall API change in the changelog.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 2 comments.

File	Description
core/web3/eth_client.py	Adds blockNumber support to multicall and refactors log filter params construction.
core/util/file_util.py	Adds noqa suppression for async-lint warnings on sync filesystem calls inside async wrappers.
core/exceptions.py	Simplifies default message/exceptionType assignment using or.
CHANGELOG.md	Documents the new blockNumber parameter on EthClient.multicall.

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