Retrieve investigations - pagination

retrieval of investigations /catalogue/:sessionId/investigations

• add limit and skip to allow pagination (eg. speed up embargoed investigations)
• search and filter by date: startDate, endDate
• search param to add, to search investigations on title, summary, name, doi, instrumentName.
• sortBy param: to sort by name, instrument, startDate, title (title vs summary??), releaseDate, doi
• sortOrder: 1 for ASC and -1 for DESC order sort