1. cache constpool in ecma vm
2. use JSPandaFile instead of panda_file::File
3. make GenerateProgram as a static function
4. add a singleton of JSPandaFileManager::GetInstance()
issue: https://gitee.com/openharmony/ark_js_runtime/issues/I4WZVV
Signed-off-by: wengchangcheng <wengchangcheng@huawei.com>
Change-Id: Ic7ccd66764c3a020e575d4046e1792475d45be6b