[GuideLLM Refactor] Core: Reintroduce changes from main (#364)

## Summary

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Include a short paragraph of the changes introduced in this PR.
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TODO

---

- [x] "I certify that all code in this PR is my own, except as noted
below."

## Use of AI

- [ ] Includes AI-assisted code completion
- [ ] Includes code generated by an AI application
- [ ] Includes AI-generated tests (NOTE: AI written tests should have a
docstring that includes `## WRITTEN BY AI ##`)

Author: sjmonson

pyproject.toml

@@ -10,6 +10,9 @@ include = ["*"]
 [tool.setuptools.package-data]
 "guidellm.data" = ["*.gz"]
 
+[tool.pdm]
+distribution = true
+
 
 # ************************************************
 # ********** Project Metadata **********
@@ -64,6 +67,10 @@ dependencies = [
 ]
 
 [project.optional-dependencies]
+recommended = [
+    "tiktoken>=0.11.0",  # For OpenAI tokenizer
+    "blobfile>=3.1.0",   # For OpenAI tokenizer
+]
 dev = [
     # build
     "build>=1.0.0",
@@ -104,6 +111,9 @@ dev = [
     "mkdocs-linkcheck~=1.0.6",
 ]
 
+[dependency-groups]
+dev = [ "guidellm[dev]" ]
+
 [project.urls]
 homepage = "https://github.com/vllm-project/guidellm"
 source = "https://github.com/vllm-project/guidellm"