Signed-off-by: Imtiyaz Shaikh <imtiyazshaikh5786@gmail.com>

Signed-off-by: Imtiyaz Shaikh <imtiyazshaikh5786@gmail.com>

refacored index add operations

refactored code to use indexStore

1.  Chore: Remove unwanted logs

1) import with updating index entries instead of replacing existing index file
2) atomic replace support for darwin platform

added feature to import/export as fdb data in zip format

1. Fix: got length of cyphertext is less than 0 error on empty file read.

1. Fix: Disable encryption for append bucket as no way to read encrypted data.

fix: exporting index files by filtering with queries 

1. Add: Lazy writer for append bucket

1. Add: Enable lazy writing for normal bucket

added feature to export and import data into fdb

Fix: Index file not created in some cases. Ex. For asset FDB on another drive.

removed unnecessary logs

1. Fix: Failed to get json data from pack on asset update.
2. Fix: Failed to get content-type from meta data.