Add MUL and DIV operations for EVM v2 with JMH benchmarks

[parthdagia05]

Description

Continues the EVM v2 implementation started in #10105 and follows the pattern established in #10154.
This PR adds the MUL (0x02) and DIV (0x04) arithmetic opcodes to the EVM v2 long[]-based stack.

Changes

• Implement MUL (0x02) and DIV (0x04) opcodes for the EVM v2 long[]-based stack, with zero heap allocation on the hot path
• Add MulOperationV2 and DivOperationV2 operation classes utilizing StackArithmetic for 256-bit arithmetic directly on the flat long[] operand stack
• Add JMH benchmarks (MulOperationBenchmarkV2, DivOperationBenchmarkV2) for both operations

Benchmarks

Baseline (v1 on main)

Benchmark (caseName) Mode Cnt Score Error Units
MulOperationBenchmark.executeOperation N/A avgt 15 225.036 ± 22.024 ns/op
DivOperationBenchmark.executeOperation DIV_FULL_RANDOM avgt 15 215.429 ± 135.653 ns/op

With this PR (v2)

Benchmark (caseName) Mode Cnt Score Error Units
MulOperationBenchmarkV2.executeOperation N/A avgt 15 58.162 ± 4.659 ns/op
DivOperationBenchmarkV2.executeOperation N/A avgt 15 53.422 ± 3.602 ns/op

Summary

Operation	v1 (ns/op)	v2 (ns/op)	Speedup
MUL	225.036	58.162	~3.9x faster
DIV	215.429	53.422	~4.0x faster

V2 also shows significantly lower variance, indicating more consistent performance.

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Locally, you can run these tests to catch failures early:

• spotless: ./gradlew spotlessApply
• unit tests: ./gradlew build
• acceptance tests: ./gradlew acceptanceTest
• integration tests: ./gradlew integrationTest
• reference tests: ./gradlew ethereum:referenceTests:referenceTests
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