Statcast cache incomplete issue

[ss77995ss]

Related Issue

• #375

Description

• Cache with statcast function will have incorrect value and cause cache.purge() not work.
• Also will cause the cache has no expire time and occupied in memory.

What cause this issue

• If df_cache is wrapped by another df_cache the parent cache will finish writing once the child cache start writing.
• Parent cache file will become invalid JSON file and cannot be parsed correctly.

How to fix

• Remove the df_cache for _small_request