type awsKMSProvider struct {
	AccessKeyID     string `bson:"accessKeyId"`
	SecretAccessKey string `bson:"secretAccessKey"`
	SessionToken    string `bson:"sessionToken,omitempty"`
}

type KMSProviders struct {
	AWS *awsKMSProvider `bson:"aws"`
	// etc
}

type autoEncryptOpts struct {
	KMSProviders         KMSProviders   `bson:"kmsProviders,omitempty"`
	SchemaMap            map[string]any `bson:"schemaMap,omitempty"`
	KeyVaultNamespace    string         `bson:"keyVaultNamespace,omitempty"`
	BypassAutoEncryption bool           `bson:"bypassAutoEncryption,omitempty"`
	EncryptedFieldsMap   map[string]any `bson:"encryptedFieldsMap,omitempty"`
	BypassQueryAnalysis  bool           `bson:"bypassQueryAnalysis,omitempty"`
}

type clientEntity struct {
	AutoEncryptOpts *autoEncryptOpts `bson:"autoEncryptOpts"`
}

	elems, err := opts.Elements()
	if err != nil {
		return nil, err
	}

	for _, elem := range elems {
		name := elem.Key()
		opt := elem.Value()
                // ...
        }