Analyze: Log analysis summaries for custom queries

[henrymercer]

This PR logs analysis summaries for custom query suites, in addition to the analysis summary for the default suite that is logged by #515.

Here's an example of an analysis summary produced when running with a custom set of diagnostic queries for Java:

Analysis summary for java
  Counted 250426 lines of code for java as a baseline.
  Analysis produced the following metric data:
  
  |               Metric                | Value |
  +-------------------------------------+-------+
  | Total lines of code in the database | 88684 |
  
  Analysis summary for custom queries:
  
  Analysis produced the following diagnostic data:
  
  | Severity |                       Message                       |
  +----------+-----------------------------------------------------+
  | error    | (6 results for diagnostic "Extraction errors")      |
  | warning  | (1184 results for diagnostic "Extraction warnings") |

Merge / deployment checklist

• Confirm this change is backwards compatible with existing workflows.
• Confirm the readme has been updated if necessary.
• Confirm the changelog has been updated if necessary.