Add an internal Logger

[grdsdev]

Feature request

To help supabase-swift maintainers fix bugs we should have an internal logging system

Describe the solution you'd like

• Implement an internal logger that can be used by Supabase and its sub-packages to log critical states and invariants.
• This logger should be configurable on the client's initialization.
• Logger should write logs to an easy-to-access file, so users can attach this log file when opening issues.
• Logs are local only and MUST never leave the device, only in the case where the user chooses to manually grab the log file and send it somewhere.
• Logger should redact any sensitive data, such as access tokens.