Add rudimentary profiling to processing pipeline

[J08nY]

From #275 (comment):

logger.info("Extracting report keywords")

Log entries like this could be replaced with some elegant way of tracking how long these stages and steps of processing take. Like a context manager that:

• Logs this message when entered and stores the time.
• Logs some exit message when exited, together with the elapsed time.

[J08nY]

Here is some manually extracted data from a full CC run on the server.
Commit: 6448911
Total duration: 9h:36m:15s

What	When	Length
Initial CSV/HTML download + process	2023-04-26 13:43:03,860	0h0m
CPEDataset from JSON	2023-04-26 13:43:43,700	0h1m
CVEDataset from JSON	2023-04-26 13:44:01,253	0h0m
PPDataset	2023-04-26 13:44:32,354	0h0m
MU dataset - download reports	2023-04-26 13:44:32,637	0h3m
MU dataset - download targets	2023-04-26 13:47:36,796	0h4m
MU dataset - convert reports	2023-04-26 13:51:33,456	0h5m
MU dataset - convert targets	2023-04-26 13:56:41,531	0h11m
MU dataset - extract report meta	2023-04-26 14:07:21,226	0h0m
MU dataset - extract target meta	2023-04-26 14:07:23,571	0h0m
MU dataset - extract report frontpage	2023-04-26 14:07:54,051	0h0m
MU dataset - extract target frontpage	2023-04-26 14:07:56,402	0h0m
MU dataset - extract report keywords	2023-04-26 14:08:03,717	0h0m
MU dataset - extract target keywords	2023-04-26 14:08:29,043	0h6m
CC scheme pages	2023-04-26 14:14:40,720	0h15m
download reports	2023-04-26 14:29:18,751	0h33m
download targets	2023-04-26 15:02:33,414	0h38m
convert reports	2023-04-26 15:40:24,238	2h27m
convert targets	2023-04-26 18:07:29,028	3h9m
extract report meta	2023-04-26 21:18:53,521	0h3m
extract target meta	2023-04-26 21:21:46,177	0h7m
extract report frontpage	2023-04-26 21:28:41,745	0m1m
extract target frontpage	2023-04-26 21:29:45,351	0h2m
extract report keywords	2023-04-26 21:31:30,754	0h16m
extract target keywords	2023-04-26 21:47:04,355	1h1m
heuristics - cert_id	2023-04-26 22:48:02,540	0h0m
heuristics - cpe match	2023-04-26 22:48:02,729	0h6m
heuristics - cve	2023-04-26 22:54:21,816	0h2m
heuristics - references	2023-04-26 22:56:16,638	0h0m
heuristics - transitive vulns	2023-04-26 22:56:18,026	0h0m
heuristics - cert labs	2023-04-26 22:56:38,557	0h0m
heuristics - SARs	2023-04-26 22:56:38,622	0h23m
End	2023-04-26 23:19:19,853

Some numbers:

The resulting dataset has 5326 certificates.
In total, we identified 22546 vulnerabilities in 367 vulnerable certificates.
There were total of 151 certificates skipped due to duplicity

The biggest culprits in the runtime are the OCR in our pdf to text conversion and the download from CC pages.