CPU pytest unit test suite (#852)

Pytest unit tests designed as a preflight before submitting a PR. Runs
fully on CPU and focuses on module level testing, transformation
correctness, and accuracy comparison between HF, transformed HF, and ORT
for representative models.

---------

Signed-off-by: Rishin Raj <rishinr@qti.qualcomm.com>
Signed-off-by: vbaddi <vbaddi@qti.qualcomm.com>
Co-authored-by: vbaddi <vbaddi@qti.qualcomm.com>

Author: quic-rishinr

QEfficient/transformers/models/modeling_auto.py

@@ -3527,6 +3527,8 @@ def check_and_get_num_speculative_tokens(self, num_speculative_tokens: Optional[
             If `num_speculative_tokens` is not an integer greater than 1.
             If `prefill_seq_len` is less than `num_speculative_tokens + 1`.
         """
+        if not self.is_tlm:
+            return None
         if hasattr(self.model.config, "speculative_config"):
             num_speculative_tokens_ = self.model.config.speculative_config["num_speculative_tokens"]
             if num_speculative_tokens is not None: