Add user settings page

[hburn7]

Depends on:

• Add /users/{id}/clients GET endpoint otr-api#205

User settings page

Allows users to adjust various settings.

Settings

For now, this issue only concerns the implementation of the Default ruleset setting as shown on the figma.

• Allow user to set their Default ruleset

Implementation

Whenever the user changes this value, submit a POST request to the endpoint defined in osu-tournament-rating/otr-api#311