Enable recursive search of HFFS.ls

[benHeid]

Models that are not located at the top-level of hugging face repos are not found. Thus, this PR enables recursive ls of offs.

Enables now:

Llama.from_pretrained(
             "LiteLLMs/OpenELM-270M-GGUF", filename="*/Q2_K-00001-of-00001.gguf",
             subfolder="Q2_K"
         )   

which would otherwise fail with:

ValueError: No file found in LiteLLMs/OpenELM-270M-GGUF that match */Q2_K-00001-of-00001.gguf

Available Files:
["Q2_K", "Q3_K", "Q3_K_L", "Q3_K_M", "Q3_K_S", "Q4_0", "Q4_1", "Q4_K", "Q4_K_M", "Q4_K_S", "Q5_0", "Q5_1", "Q5_K", "Q5_K_M", "Q5_K_S", "Q6_K", "Q8_0", ".gitattributes"]