feature request: Customise Phone Input Country Codes

[mrfrase3]

What problem did you meet?

Depending on your SMS provider and the plan you have with them, you are likely only able to send to phone numbers in certain countries.

Describe what you'd like Logto to have

The ability to customise the countries the SMS connector to send to, which then flows to the country code selector in the experience flow.

bonus: If you did an API call to get the list of supported country codes, you could look for the cloudflare geolocation country header and if present, provide a recommended default country code in the response. (so users in not the US aren't getting defaulted to the US +1 region code)