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feat: Unnormalize waiting requests + predictive load updates for Python router (mirroring Rust) + softmax sampling to reduce thrashing (#1638)

Signed-off-by: Hongkuan Zhou <tedzhouhk@gmail.com>
Co-authored-by: hhzhang16 <54051230+hhzhang16@users.noreply.github.com>
Co-authored-by: Alec <35311602+alec-flowers@users.noreply.github.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Signed-off-by: Hongkuan Zhou <tedzhouhk@gmail.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

We can now do this:

- Node 1:

```
dynamo-run in=http out=dyn
```

- Node 2 and 3, two instances of component 'backend' in the nemotron_ultra pipeline:

```
dynamo-run in=dyn://nemotron_ultra.backend.generate out=vllm /data/models/NemotronUltra
```

- Node 4 and 5, two instances of the 'backend' component in nemotron_super pipeline:

```
dynamo-run in=dyn://nemotron_super.backend.generate out=vllm /data/models/NemotronSuper
```

The ingress node will discover all four instances and route correctly. We have been planning for this for a long time now.

As part of this auto-discovery is now always `out=dyn`, with no extra URL parts. Previously it could only route to a single pipeline.

Also:
- Refactor endpoint / instance naming now that I understand them
- Fix removing models when their instance stops.

Co-authored-by: mohammedabdulwahhab <furkhan324@berkeley.edu>

Signed-off-by: Hongkuan Zhou <tedzhouhk@gmail.com>
Co-authored-by: ishandhanani <82981111+ishandhanani@users.noreply.github.com>
Co-authored-by: ishandhanani <ishandhanani@gmail.com>
Co-authored-by: Ubuntu <ubuntu@dev-inst-2w1vokvyuts83rzn4n1k7mnzew9.us-central1-a.c.brevdevprod.internal>
Co-authored-by: Biswa Panda <biswa.panda@gmail.com>
Co-authored-by: Anant Sharma <anants@nvidia.com>

Co-authored-by: ishandhanani <ishandhanani@gmail.com>

Co-authored-by: ishandhanani <82981111+ishandhanani@users.noreply.github.com>

Co-authored-by: Ziqi Fan <ziqif@nvidia.com>

feat: ETCD prefix watcher + python binding + runtime reconfiguration for router and disagg router  (#581)
Signed-off-by: Hongkuan Zhou <tedzhouhk@gmail.com>
Co-authored-by: Neelay Shah <neelays@nvidia.com>

Neelay approved merge

feat: Extract Common Configs + Log Configs on Init + Add `test_` to `sdk/tests` filenames required for pytest (#434)
Co-authored-by: ishandhanani <82981111+ishandhanani@users.noreply.github.com>