refactor: use strings.Builder to improve performance

[zhetaicheleba]

strings.Builder has fewer memory allocations and better performance.
More info: golang/go#75190

Inspired by #17696 and replace all the case.

[Copilot]

Pull request overview

This PR refactors string concatenation operations to use strings.Builder for improved performance and reduced memory allocations. The change replaces direct string concatenation (using +=) with strings.Builder methods across test code, compilation utilities, and runtime functions.

Key changes:

• Replaced string concatenation with strings.Builder in loops and multiple append operations
• Added strings import where needed
• Changed return statements to use Builder.String() method

Reviewed changes

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

Show a summary per file

File	Description
execution/vm/evm_test.go	Converted two string concatenation patterns in test code to use strings.Builder
execution/vm/asm/compiler.go	Refactored hex encoding loop to build binary string using strings.Builder
execution/protocol/block_exec.go	Updated gas logging to use strings.Builder for transaction gas list formatting
execution/commitment/trie/debug.go	Converted debug string formatting in fstring method to use strings.Builder
execution/abi/type.go	Refactored tuple expression building to use strings.Builder for canonical parameter construction

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[Copilot]

String concatenation (indices[i] + \": <nil> \") defeats the purpose of using strings.Builder. Use resp.WriteString(indices[i]) followed by resp.WriteString(\": <nil> \") to avoid intermediate string allocation.

Suggested change

	resp.WriteString(indices[i] + ": <nil> ")
	resp.WriteString(indices[i])
	resp.WriteString(": <nil> ")

[Copilot]

Multiple string concatenations (indices[i] + \": \" + node.fstring(...) and ind+\" \") create intermediate allocations. Split into separate WriteString calls: resp.WriteString(indices[i]), resp.WriteString(\": \"), resp.WriteString(node.fstring(ind+\" \")). Consider also passing a strings.Builder to fstring to avoid the inner concatenation ind+\" \".