🎚️ feat: Custom Parameters (#7342)

* #

* - refactor: simplified getCustomConfig func

* #

* - feature: persist values for parameters with optionType of custom

* #

* - refactor: moved `Parameters/settings.ts` into `data-provider` so that both frontend and backend code can use it.

* - feature: loadCustomConfig can now parse and validate customParams property for `endpoints.custom` in `librechat.yaml`

* # fixed linter

* # removed .strict() in config.ts

* change: added packages/data-provider/src to SOURCE_DIRS for i18n check

* # removed unnecessary lodash imports

* # addressed PR comments
# fixed lint for updated files

* # better import for lodash (w/o relying on tree-shaking)

client/src/components/SidePanel/Parameters/DynamicSlider.tsx

@@ -33,7 +33,7 @@ function DynamicSlider({
   );
 
   const [setInputValue, inputValue, setLocalValue] = useDebouncedInput<string | number>({
-    optionKey: optionType !== OptionTypes.Custom ? settingKey : undefined,
+    optionKey: settingKey,
     initialValue: optionType !== OptionTypes.Custom ? conversation?.[settingKey] : defaultValue,
     setter: () => ({}),
     setOption,