Add support for disabling GORM slow query logging

[Copilot]

GORM logs queries exceeding 200ms by default. Users have no way to suppress these logs in production environments where large policy sets trigger false-positive warnings.

Changes

New API:

• NewAdapterWithConfig(driverName, dataSourceName, config, params...) - Constructor accepting custom gorm.Config
• NewConfigWithoutSlowQueryLog() - Helper returning silent logger config

Internal:

• Added gormConfig field to Adapter struct
• Modified openDBConnection() to accept variadic config parameter
• Extracted parseAdapterParams() to reduce duplication between constructors

Usage

// Disable slow query logs
config := gormadapter.NewConfigWithoutSlowQueryLog()
a, _ := gormadapter.NewAdapterWithConfig("mysql", "user:pass@tcp(127.0.0.1:3306)/", config)

// Or custom logger level
config := &gorm.Config{
    Logger: logger.Default.LogMode(logger.Error),
}
a, _ := gormadapter.NewAdapterWithConfig("postgres", "...", config, "dbname")

Existing NewAdapter() calls remain unchanged - this is additive only.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>How can I disable the slow log output</issue_title>
<issue_description>Hi
How can I disable the slow log output:

dev-tintin-system authz-deployment-7786685fcd-xp7cp authz-service 2025/11/22 03:04:01 /go/pkg/mod/github.com/casbin/gorm-adapter/v3@v3.37.0/adapter.go:505 SLOW SQL >= 200ms
dev-tintin-system authz-deployment-7786685fcd-xp7cp authz-service [1275.311ms] [rows:63851] SELECT * FROM "casbin_rule" ORDER BY ID
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes How can I disable the slow log output #275

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[nomeguy]

@copilot don't add so complicated code, just disable the slow log directly and entirely, no need to add config option.

and no need to add go test