[Tuner] Type inconsistencies between libtuner and rocm backend

[RattataKing]

Tuner will hit a runtime error with --benchmark-timing-method=rocprof:

File "amd-shark-ai/amdsharktuner/amdsharktuner/libtuner.py", line 1113, in get_valid_time_us
    if result.is_valid()
       ^^^^^^^^^^^^^^^
AttributeError: 'RocProfBenchmarkResult' object has no attribute 'is_valid'

This happens because rocm_common.RocProfBenchmarkResult does not inherit from libtuner.BenchmarkResult, and the tool-agnostic benchmark design fails at:

benchmark_tool_config = rocm_common.RocProfConfig(benchmark_fn=rocm_common.run_rocprof_command)
result = benchmark_tool_config.benchmark_fn(BenchmarkPack(...)) # returned RocProfBenchmarkResult

There are multiple ways to fix this bug:

1. Add is_valid() to RocProfBenchmarkResult
2. Move BenchmarkResult from libtuner to common, replace RocProfBenchmarkResult in rocm_common
3. Add benchmark_tool_config.convert_benchmark_result

This bug bypassed mypy check due to the inconsistent and overly loose typing between tuner and its target backend, some other risky codes I found are:

run_rocprof_command(benchmark_pack: Any)
benchmark_fn: Callable

When needed, we can rehome some class in libtuner all together and leave in the same place, for example:
BenchmarkResult BenchmarkPack, CandidateTracker, CompilePack, not limited to common.py because they are not used by other files