0.1.1 Supported File Formats and I/O

[tusharchou]

Problem Statement

In the present implementation, redundant classes are created, such as store.source.iceberg and store.source.iceberg.

Proposed Solution

As discussed on #27 we need to create a separate module for supported file format.

[tusharchou]

@abhishekkar0603 @mrutunjay-kinagi as discussed offline I will create a change in the present structure before 0.1.1 release so that we can follow that structure going ahead