eth/tracers/js: add coinbase addr to ctx #30231

[gzliudan]

Proposed changes

Ref: ethereum#30231

Add coinbase address to javascript tracer context.

This PR adds the coinbase address to jsTracer.ctx, allowing access to the coinbase address (fee receipient) in custom JavaScript tracers.

Example usage:

result: function(ctx) {
  return toAddress(ctx.coinbase);
}

This change enables custom tracers to access coinbase address, previously unavailable, enhancing their capabilities to match built-in tracers.

Types of changes

What types of changes does your code introduce to XDC network?
Put an ✅ in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)
• Regular KTLO or any of the maintaince work. e.g code style
• CICD Improvement

Impacted Components

Which part of the codebase this PR will touch base on,

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• Consensus
• Account
• Network
• Geth
• Smart Contract
• External components
• Not sure (Please specify below)

Checklist

Put an ✅ in the boxes once you have confirmed below actions (or provide reasons on not doing so) that

• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
• Provide an end-to-end test plan in the PR description on how to manually test it on the devnet/testnet.
• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
• Relevant documentation has been updated as part of this PR
• N/A