perf: optimize automaton string acceptance by bypassing execution trace

[Tugamer89]

What: Introduced a fast-path override for the accepts(String input) method in the DFA, NFA, and ENFA classes.
Why: The default accepts method calls execute(input), which instantiates ExecutionTrace and a new ExecutionStep for every transition. This causes massive memory allocations and garbage collection overhead during large string validations.
Impact: Local benchmarks indicate an improvement of roughly 55% in evaluation speed and virtually zero intermediate heap allocations, avoiding O(n) node allocation.
Measurement: Verified via Benchmark.java and BenchmarkNFA.java (now deleted) that standard string execution is heavily optimized while mvn clean test -Dmaven.compiler.source=21 -Dmaven.compiler.target=21 ensures 100% logic parity.

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PR created automatically by Jules for task 1050770946085040511 started by @Tugamer89

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud