Add BackedEnum support for log name

[alexanderkroneis]

Add BackedEnum support for log names

You can now use a string- or int-backed enum as a log name. The enum's value
is stored in the database.

enum LogName: string
{
    case Orders = 'orders';
    case Auth = 'auth';
}

// Writing
activity(LogName::Orders)->log('Order placed');   // log_name => 'orders'
activity()->useLog(LogName::Auth)->log('Login');

// Querying
Activity::inLog(LogName::Orders)->get();
Activity::inLog(LogName::Orders, LogName::Auth)->get();

By default log_name reads back as a string. To hydrate it back into an enum, set the class in the config:

  // config/activitylog.php
  'default_log_enum' => \App\Enums\LogName::class,

  Activity::all()->last()->log_name; // LogName::Orders

Note

default_log_enum is global, so only one enum applies. Log names that aren't one of its values (e.g. default) come back as plain strings.

[alexanderkroneis]

@claude Can you review what I submitted? Think about edge cases, breaking changes.