Build a graph of FIPS algorithm references

[J08nY]

The idea:

This might mean some changes in the ReferenceFinder class but honestly just building something up in a notebook first is probably the right way. The first step is to get a proper dataset of FIPS algorithms with the certificates that mention a given algorithm, this should be split by the different sources of algorithm mentions (web and PDF). The PDF ones should be cleaned first however, as the raw ones may contain lots of BS.

[J08nY]

This is connected to the effort in #275 but only slightly. Some of the cleanup will be required here. It can happen here and be merged there or the other way around.

[adamjanovsky]

Actually, @GeorgeFI will revisit FIPS references and conduct their analysis. If @J08nY agrees, could we pls assign him with this? It seems like a subtask of the overall FIPS reference analysis.

[J08nY]

Makes sense!