Refactor the usage of file cache
### Motivation
There may be many kinds of file cache for different scenarios.
So the logic of the file cache should be hidden inside the file reader,
so that for the upper-layer caller, the change of the file cache does not need to
modify the upper-layer calling logic.
### Details
1. Add `FileReaderOptions` param for `fs->open_file()`, and in `FileReaderOptions`
1. `CachePathPolicy`
Determine the cache file path for a given file path.
We can implement different `CachePathPolicy` for different file cache.
2. `FileCacheType`
Specified file cache type: SUB_FILE_CACHE, WHOLE_FILE_CACHE, FILE_BLOCK_SIZE, etc.
2. Hide the cache logic inside the file reader.
The `RemoteFileSystem` will handle the `CacheOptions` and determine whether to
return a `CachedFileReader` or a `RemoteFileReader`.
And the file cache is managed by `CachedFileReader`
