[fix] Remove SpecConfig and fix thread leak issues

[mikeiovine]

Description

In #5639, we had to keep the unused SpecConfig class around. Removing this line would inexplicably cause thread leak issues in certain seemingly unrelated tests:

from tensorrt_llm._torch.speculative import SpecConfig

The root cause is:

1. When you import tensorrt_llm._torch.speculative, torch._inductor.lowering gets imported implicitly.
2. This import starts a new thread:

import threading def get_threads(): return [t.name for t in threading.enumerate()] print("Before", get_threads()) from torch._inductor import lowering print("After", get_threads()) # Prints the following # Before ['MainThread'] # After ['MainThread', 'Thread-1 (_read_thread)']

3. If the import occurs before the test starts, there are no issues. But if the import occurs after the test starts (e.g. by a lazy import in the LLM construction), pytest will think you leaked the thread and the test will fail.

This PR fixes the issue by adding import torch._inductor.lowering to __init__.py in our testing folder. I don't think it makes sense to add this to TRTLLM itself since this issue is strictly confined to testing with thread leak checks.

Also cleaned up some leftovers from #5639 (remove SpecConfig and get rid of incorrect type annotations).

Test Coverage

Existing tests.

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[mikeiovine]

/bot run

[tensorrt-cicd]

PR_Github #11570 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #11570 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #8566 completed with status: 'FAILURE'

[wili-65535]

Great work!
The phenomenon is reproduced locally with Michael's script.
This improvement makes the code much clearer.

[QiJune]

LGTM

[mikeiovine]

/bot run

[tensorrt-cicd]

PR_Github #11661 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #11661 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #8636 completed with status: 'SUCCESS'

[mikeiovine]

/bot reuse-pipeline --comment "Pipeline passed before rebase"

[tensorrt-cicd]

PR_Github #11705 [ reuse-pipeline ] triggered by Bot

[tensorrt-cicd]

PR_Github #11705 [ reuse-pipeline ] completed with state SUCCESS
Reusing PR_Github #11661 for commit 141be7c