[types] build/usage improvements

[olegrok]

This patch set contains two improvements:

• Reducing code duplication via reusing FeePack structure
• Replacing "go:generate" directives to Makefile usage (just to support only one build system and also it will be useful in future when we will change SSZ to RLP encoding).

[Copilot]

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[Copilot]

Pull Request Overview

This pull request refactors fee handling by replacing separate fee fields (FeeCredit, MaxPriorityFeePerGas, and MaxFeePerGas) with a unified FeePack structure and removes obsolete go:generate directives.

• Reduces code duplication by reusing the FeePack structure in transaction types and related functions.
• Replaces multiple go:generate directives with Makefile usage for building and future-proofing the encoding system.

Reviewed Changes

Copilot reviewed 27 out of 28 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
nil/services/rpc/types/types.go	Updated transaction creation to use FeePack instead of individual fee fields.
nil/services/rpc/jsonrpc/types.go	Embedded FeePack in Transaction and updated conversion in NewTransaction.
nil/services/rpc/txpool_api_test.go	Updated test transactions to use FeePack initialization.
nil/services/faucet/jsonrpc.go	Replaced fee fields with FeePack creation via NewFeePackFromGas.
nil/internal/types/transaction.go	Refactored TransactionDigest and related conversions to use FeePack.
*Other files (version_info.go, signature.go, receipt.go, log.go, exec_errors.go, collator.go, block.go, account.go, etc.)	Removed redundant go:generate directives and updated fee pack usage accordingly.

Files not reviewed (1)

• nil/internal/types/Makefile.inc: Language not supported