* Add a NORMED options on field
Make fieldnorm indexation optional:
* for all types except text => added a NORMED options
* for text field
** if STRING, field has not fieldnorm retained
** if TEXT, field has fieldnorm computed
* Finalize making fieldnorm optional for all field types.
- Using Option for fieldnorm readers.
* add support for indexed bytes fast field
* remove backup code file
* refine test cases
* Simplified unit test. Renamed it as it is testing the storable part. Not the indexed part.
* Small refactoring and added unit test. If multivalued we only retain the first FAST value.
Co-authored-by: Raul <raul.tang.lc@gmail.com>
