1. Fix: Failed to get asset fro Asset type FDB.

1. Fix: Required Error type not set in case of delete operation

1. Fix: Error while updating data which is not present

1. Fix: Asset not saved to mixed bucket due to extra index field "name".
2: Fix: Failed to get saved asset due to missing "rowID" in index.

1. FIx: Error not handled on index update

* added encryption support in fdb 
* added feature of dynamic encryption key generation function

added global lock for lazy write in append  bucket 

moved packfile related functions in filemdl and done changes in fdb accordingly

File lock code commented

added feature of writing data lazily in corefdb Append bucket file

1. Fix: Failed to fetch data after FDB Update operation

1. Add: Return updated records in case of update

add encryption and compression support for pack bucket

1. Fix: Lazy object expired from cache resulting in failed operations.
2. Fix: Success on update operation in pack even if object with primary key is not present.

1. Fix: Data updated but error thrown because of deleted records.

1. Fix: Atomic file not updated, Hard link issue.
2. Add: Create temp directory if not present at app root.

now we dont have to specify each index field in selector to update record

1. Fix: Data not updated because of safe write