Create option to enrich citation table

[jeroarenas]

Use Semantic Scholar API to enrich citation table with the following information:

• isInfluential
• BackIntent
• MethodIntent
• ResultIntent

This information is very useful, but probably costly to obtain. So:

1. Check if part of this information could be obtained online, or if we have access to the software they use and it is feasible to run it
2. Implement the possibility of enriching using the API (is this already implemented?). Add for this second case the possibility of filtering with some paper metadata. E.g., enrich only information from papers beloinging to a certain S2 Field.