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2.examples中添加medusa readme
3.修复model_runner中input_positions配置错误的笔误，解决多个模型运行失败问题

Co-authored-by: simon-mo <xmo@berkeley.edu>
Co-authored-by: Chang Su <chang.s.su@oracle.com>
Co-authored-by: Simon Mo <simon.mo@hey.com>
Co-authored-by: Roger Wang <136131678+ywang96@users.noreply.github.com>
Co-authored-by: Roger Wang <ywang@roblox.com>

Signed-off-by: Travis Johnson <tsjohnso@us.ibm.com>

Signed-off-by: Alex-Brooks <Alex.Brooks@ibm.com>

Signed-off-by: Joe Runde <Joseph.Runde@ibm.com>

Co-authored-by: Nick Hill <nickhill@us.ibm.com>
Co-authored-by: rshaw@neuralmagic.com <rshaw@neuralmagic.com>
Co-authored-by: Robert Shaw <114415538+robertgshaw2-neuralmagic@users.noreply.github.com>
Co-authored-by: Simon Mo <simon.mo@hey.com>

Signed-off-by: Aaron Pham <contact@aarnphm.xyz>
Co-authored-by: Cyrus Leung <cyrus.tl.leung@gmail.com>

Signed-off-by: Alex-Brooks <Alex.Brooks@ibm.com>

[Hotfix][Core][VLM] Disable chunked prefill by default and prefix caching for multimodal models (#8425)

[MISC] Keep chunked prefill enabled by default with long context when prefix caching is enabled (#8342)

Co-authored-by: Michael Goin <michael@neuralmagic.com>

Co-authored-by: Harsha Bikki <harbikh@amazon.com>