This PR calculates the size of the inverted index files. The changes consist of:
Introduction of a new get_inverted_index_size() method in different column writers such as ScalarColumnWriter, StructColumnWriter, ArrayColumnWriter, and MapColumnWriter. This method will fetch the size of the inverted index file associated with that column. If the file size cannot be fetched, it defaults to 0.
A new method file_size() has been added in InvertedIndexColumnWriter class which retrieves the size of the file stored on disk. If the file size cannot be fetched, it logs an error and returns -1.
Additionally, a new method get_inverted_index_file_size() is introduced in SegmentWriter which aggregates the inverted index file sizes of all the column writers.
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