…Store in favour of newly introduced PDF aggregation service

Initial implementation, proof of concept.

…Store in favour of newly introduced PDF aggregation service

Refined implementation. Subworkflow still to be integrated with IIS main workflow.

…Store in favour of newly introduced PDF aggregation service

Limiting entries to the ones with actual_url not null in other not to violate the DocumentContentURL schema constraints.

…Store in favour of newly introduced PDF aggregation service

Renaming `actual_url` to `location` as a column reference pointing to S3 content location.

…Store in favour of newly introduced PDF aggregation service

Enabling the new hive-based content metadata importer with content_url importer uber workflow and metadataextraction cache builder.

…Store in favour of newly introduced PDF aggregation service

Excluding conflicting jackson libraries.

…he builder workflow

…Store in favour of newly introduced PDF aggregation service

The following new properties are supported:
* `import_content_pdfaggregation_table_name` to be specified in at runtime 'dbname.tablename' format to indicate both hive database and table
* `import_content_pdfaggregation_hive_metastore_uris` with URIs pointing to the hive metastore utilized by the PDF aggregation subsystem, to be defined statically in IIS environment (default-config.xml file)

New hive-based PDF aggregation service support is automatically enabled by providing explicit `import_content_pdfaggregation_table_name` parameter value at runtime. When the parameter is unspecified then content importer module works in legacy mode (objectstore compatible).

…Store in favour of newly introduced PDF aggregation service

Applying code review fixes.