added instrumentation test for LlamaModule

[davidlin54]

Added instrumentation test for LlamaModule.

1. Modified setup.sh to include building stories110M model and moves it into src/androidTest/resources
2. Added test cases for LlamaModule by generating a sequence length of 32, and verifying the length. Also verifies that stop() works by checking output length is less than input sequence length

[davidlin54]

Stack from ghstack (oldest at bottom):

• move junit tests to android_test #6761
• add script to generate add.pte #6760
• -> added instrumentation test for LlamaModule #6759

[pytorch-bot]

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As of commit e36ca0a with merge base b23c9e6 ():
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[kirklandsign]

You can also add it to https://github.com/pytorch/executorch/blob/main/.github/workflows/_android.yml#L99 if you are interested

[kirklandsign]

You can also add it to https://github.com/pytorch/executorch/blob/main/.github/workflows/_android.yml#L99 if you are interested

[davidlin54]

You can also add it to https://github.com/pytorch/executorch/blob/main/.github/workflows/_android.yml#L99 if you are interested

will add in a follow up!