export load binary gaia file for custom source

[JohnTsaii]

这个export 是为了自定义TemplateSource的时候,能直接通过自定义路径解析二进制数据。原有的方法会去gaiax定义的路径去获取

- (NSDictionary *)readTemplateContenttWithFolderPath:(NSString * _Nonnull)folderPath
                                          templateId:(NSString * _Nonnull)templateId
                                     templateVersion:(NSString * _Nullable)templateVersion {
···
    //获取二进制文件路径
    NSString *gaiaXPath = [GXTemplatePathHelper loadBinaryFilePathWithFolderPath:folderPath fileName:templateId fileType:nil];
···
}

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[biezhihua]

@JohnTsaii 我的同事会尽快进行review。