Add compatibility data for non-Tesla access to Superchargers

[quicklywilliam]

Currently the API does not distinguish between Superchargers that are only compatible with Teslas, and those that work with other vehicles (either those with a built-in NACS port or those with an CCS->NACS adapter). This data is available via this json endpoint:
https://www.tesla.com/api/findus/get-locations?country=US&view=map

In it, find the open_to_non_tesla and charging_accessibility fields. The former suffices, but per #310, you can use the charging_accessibility field to distinguish between Superchargers that have a CCS port ("charging_accessibility": "All Vehicles (Production)") and those that need an NACS port/adapter ("charging_accessibility": "NACS Partner Enabled (Production)").

Would be great to see this data added.

[reger-nrel]

@quicklywilliam we do have plans to differentiate between Tesla chargers with NACS/J3400 vs original Tesla connectors. I don't have a timeline for you.

The URL you provided above does not return anything for me. As stated in response to your comment in the other thread, we don't have access to their API(s). We've had discussions for some time, but we have not been given access.

[quicklywilliam]

@reger-nrel Ah, interesting. I am able to load it in a private browser tab, but I see now that fetching via curl etc does not work. To work around this, I went ahead and created this project:
https://github.com/quicklywilliam/nonteslasuperchargers