Implement alt token fee

[curryxbo]

1. Purpose or design rationale of this PR

...

2. PR title

Your PR title must follow conventional commits (as we are doing squash merge for each PR), so it must start with one of the following types:

• build: Changes that affect the build system or external dependencies (example scopes: yarn, eslint, typescript)
• ci: Changes to our CI configuration files and scripts (example scopes: vercel, github, cypress)
• docs: Documentation-only changes
• feat: A new feature
• fix: A bug fix
• perf: A code change that improves performance
• refactor: A code change that doesn't fix a bug, or add a feature, or improves performance
• style: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)
• test: Adding missing tests or correcting existing tests

3. Deployment tag versioning

Has the version in params/version.go been updated?

• This PR doesn't involve a new deployment, git tag, docker image tag, and it doesn't affect traces
• Yes

4. Breaking change label

Does this PR have the breaking-change label?

• This PR is not a breaking change
• Yes

Summary by CodeRabbit

• New Features

  • Pay gas with ERC20-like tokens via a new alternate-fee transaction type; wallets and RPCs accept fee token ID and fee limit.
  • Transaction receipts, traces and execution results include token-fee metadata (token ID, rate, scale, limit).

• Improvements

  • Gas estimation, mempool validation and promotion consider ERC20 balances and ETH↔token conversions.
  • Light clients, tracers and tooling expose ERC20-fee fields for better observability and validation.