Settings UI improvement

[brichet]

Fixes #35

record-2025-02-20_18.17.07.webm

This PR uses a react component in the settings panel, to make it more reactive and configurable.
With this new setting component:

• settings are saved for each provider, and restored when loading the page again (use local storage)
• the field containing the word 'key' are replaced by a password widget

It also use a simpler way to import generated schema, no need to set it up manually when adding a new provider.

[brichet]

This PR is missing some helpers about the use of each provider, as described in #35 (comment).

Since this is using a FormComponent, helper could easily be included above or below it.
A better user experience could be to include it between the provider select and the dynamic settings. This option needs some refactoring to split the form, and include the helper.