feat: save provider access/refresh tokens in cookies

[mitjans]

Store provider access/refresh tokens in cookies

This PR stores provider access/refresh tokens in cookies, to allow server routes to use provider APIs.

Types of changes

• New feature (a non-breaking change which adds functionality)

Description

When logging in users with external API scopes for a provider (for example, Github), the application will need access to the provider token to access the provider's API. This token is stored in the session object, which is only stored in the client (if I'm not mistaken).

When calling an API in my project, only sb-access-token and sb-refresh-token cookies are sent, which means that if I want to access Github's API from a server route, I won't be able to do so.

As I see it, there are 2 workarounds for this:

1. Store provider's access/refresh tokens in a Supabse table and access that table from server (vanilla, and cumbersome)
2. Store provider's access/refresh tokens in a cookie, so that the server has direct access if needed.

This PR implements the second solution. To access the provider's token from the server, one can simply:

export default defineEventHandler((event) => {
  const providerToken = getCookie(event, 'sb-provider-token');

  ...
});

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes (if not applicable, please state why)

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