added global lock for lazy write in append  bucket 

* removed unused code
* added lock for reading pack file

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

Fix: Error suppressed in CallService()

Closes #5

See merge request !123

1. Fix: Error suppressed in CallService(). This makes users unaware of the actual error from called service.

fix: fail to write fdb index lazily

See merge request !122

added defer for closing file

See merge request !121

File lock code commented

See merge request !120

File lock code commented

added filelock while performing data manipulation on fdb bucket

See merge request !118

Workerpool with cancellable context

See merge request !117

feature of lazy append

See merge request !116

added feature of writing data lazily in corefdb Append bucket file

Get local service data function added

See merge request !114

Get local service data function added

Fix: Multiple FDB issues

See merge request !112

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

Change errr message in extractPricipalObject method (routerbuilder) for userid length check

See merge request !110

Timeout added in downloadhelper.mdl

See merge request !111

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.

soft delete database and slsdashboard changes

See merge request !109

soft delete database and slsdashboard changes

Email:  Reply-To feature added

See merge request !108

Add: Pack bucket and lazy writing indexes

See merge request !107

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