Bug: types.WithMetadatas fails because of assignment to nil map

[mempirate]

The WithMetadatas(md) record option fails, because it is trying to set a value on an uninitialized map:

chroma-go/types/record.go

Lines 39 to 51 in 1b1e6ef

	func WithMetadatas(metadata map[string]interface{}) Option {
	return func(r *Record) error {
	for k, v := range metadata {
	switch v.(type) {
	case string, int, float32, bool:
	r.Metadata[k] = v
	default:
	return &InvalidMetadataValueError{Key: k, Value: v}
	}
	}
	return nil
	}
	}

The map should be initialized like in WithMetadata:

chroma-go/types/record.go

Lines 53 to 66 in 1b1e6ef

	func WithMetadata(key string, value interface{}) Option {
	return func(r *Record) error {
	if r.Metadata == nil {
	r.Metadata = map[string]interface{}{}
	}
	switch value.(type) {
	case string, int, float32, bool:
	r.Metadata[key] = value
	default:
	return &InvalidMetadataValueError{Key: key, Value: value}
	}
	return nil
	}
	}

[tazarov]

@mempirate, I'll fix shortly in #189. Thanks for raising this.