* 🍱 Add new fixture for PVPC data from authenticated API call
and update mocked server responses when data is not available
(now returns a 200 OK with empty data)
* ✨ Implement optional API token in config-flow + options
to make the data download from an authenticated path in ESIOS server
As this is an *alternative* access, and current public path works for the PVPC,
no user (current or new) is compelled to obtain a token,
and it can be enabled anytime in options, or doing the setup again
When enabling the token, it is verified (or "invalid_auth" error),
and a 'reauth' flow is implemented, which can change or disable the token if
it starts failing.
The 1st step of config/options flow adds a bool to enable this private access,
- if unchecked (default), entry is set for public access (like before)
- if checked, a 2nd step opens to input the token, with instructions
of how to get one (with a direct link to create a 'request email').
If the token is valid, the entry is set for authenticated access
The 'reauth' flow shows the boolean flag so the user could disable a bad token
by unchecking the boolean flag 'use_api_token'
* 🌐 Update strings for config/options flows
* ✅ Adapt tests to check API token option and add test_reauth
* 🎨 Link new strings to those in config-flow
* 🐛 tests: Fix mocked date-change with async_fire_time_changed
* ♻️ Remove storage of flag 'use_api_token' in config entry
leaving it only to enable/disable the optional token in the config-flow
* ♻️ Adjust async_update_options
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