tldextract used with a file url caches the file

[mimi89999]

1. Delete the cache if it exists (~/.cache/python-tldextract/)
2. Initialize and use tldextract with the list from a file: import tldextract; tldextract.TLDExtract(suffix_list_urls=("file:///usr/share/publicsuffix/public_suffix_list.dat",))("debian.org")
3. Notice that ~/.cache/python-tldextract/ is created or that tldextract logs a warning on read only systems

I think that it makes little sense to copy the specified file to cache. It does however create several issues:

1. On read only systems cache needs to be explicitly disabled to avoid warnings
2. More importantly, modifications in the suffix file don't immediately affect the results of tldextract leading to a lot of confusion

[jvanasco]

The current behavior caches this information so other runs, which don't specify a file, will leverage the cache in the future.

The cache also contains a processed version of the TLD data, not just the raw data.

I think the additional functionality you need is to either (or both):

1- explicitly disable caching, which will be a performance hit
2- some sort of tooling to separately pre-generate the cache, and define where to pull it from.