Delete the tensor builder from vineyard llm kv cache to reduce the dependencies like arrow

[dashanji]

Describe your problem

In the current design of llm kv cache, we use the tensor builder to build the blob of kv cache. However, we don't use the arrow buffer of the tensor builder. It's better to delete the tensor builder dependencies and create a new class to wrapper the tensor builder without the arrow dependencies.

Original:

$ ldd libvineyard_llm_cache.so | grep arrow
libarrow.so.1500 => /lib/x86_64-linux-gnu/libarrow.so.1500 (0x00007f5da9879000)

Expected:

$ ldd libvineyard_llm_cache.so | grep arrow