[Examples] Standardize AWQ example

[kylesayrs]

Purpose

• Standardize awq example to follow the same format as the other examples

Changes

• Rearrange code to match the format of other examples
• Use the chat template to match format of other examples
• Do not load 100x more samples than are needed: instead, only load the number of examples that is required
• Do not manually truncate input ids, instead utilize the truncation provided by the tokenizer

Testing

• Ran example to completion and confirmed good generation

[github-actions]

👋 Hi! Thank you for contributing to llm-compressor. Please add the ready label when the PR is ready for review.

Note: This is required to complete the testing suite, please only add the label once the PR is code complete and local testing has been performed.

[dsikka]

Please close this ticket when this lands:
INFERENG-605

[kylesayrs]

Still want a proper readme for AWQ

[brian-dellabetta]

When this is in I can add another PR to resolve this issue

and update it with the QuantizationMixin changes

[markurtz]

Small NIT, otherwise looks good

[brian-dellabetta]

Thanks for tackling this!