fix: provider settings in top level field of configuration (#1161)

Configuration for some providers was given in the sub-field `provider_settings`
combining the settings of several providers. Pydantic does not understand
this very well and the configuration became cumbersome, especially in EOSdash.

All provider settings from the `provider-settings` sub-field are now lifted
to the top level field of the configuration.

The changes are automatically migrated in the configuration.

Signed-off-by: Bobby Noelte <b0661n0e17e@gmail.com>

tests/testdata/eos_config_unstripped.json

@@ -1,14 +1,7 @@
 {
   "general": {
-    "version": "0.2.0.dev2603031877440961",
-    "data_folder_path": "/home/bobby/.local/share/net.akkudoktor.eos",
-    "data_output_subpath": "output",
-    "latitude": 52.52,
-    "longitude": 13.405,
-    "timezone": "Europe/Berlin",
-    "data_output_path": "/home/bobby/.local/share/net.akkudoktor.eos/output",
-    "config_folder_path": "/home/bobby/.config/net.akkudoktor.eos",
-    "config_file_path": "/home/bobby/.config/net.akkudoktor.eos/EOS.config.json"
+    "version": "__ANY__",
+    "data_output_subpath": "output"
   },
   "cache": {
     "subpath": "cache",
@@ -34,8 +27,7 @@
   },
   "logging": {
     "console_level": null,
-    "file_level": null,
-    "file_path": "/home/bobby/.local/share/net.akkudoktor.eos/output/eos.log"
+    "file_level": null
   },
   "devices": {
     "batteries": [
@@ -302,9 +294,9 @@
     "loadakkudoktor": {
       "loadakkudoktor_year_energy_kwh": 3000
     },
-    "loadvrm": {
-      "load_vrm_token": "your-token",
-      "load_vrm_idsite": 12345
+    "vrm": {
+      "token": "your-token",
+      "site_id": 12345
     },
     "loadimport": {
       "import_file_path": null,
@@ -319,10 +311,6 @@
   },
   "pvforecast": {
     "provider": "PVForecastAkkudoktor",
-    "provider_settings": {
-      "PVForecastImport": null,
-      "PVForecastVrm": null
-    },
     "planes": [
       {
         "surface_tilt": 7,
@@ -476,9 +464,6 @@
   },
   "weather": {
     "provider": "BrightSky",
-    "provider_settings": {
-      "WeatherImport": null
-    },
     "providers": [
       "BrightSky",
       "ClearOutside",