Add metrics to summarization

[EdColeman]

Table summaries were added in ACCUMULO-4500. Need to add metrics to the summary retrieval rpc and file operations.

Also referenced:

Accumulo-4500 (closed) Implement visibility histograms as a table feature
Accumulo-4607: Add tracing support for summarization

(moved from JIRA: ACCUMULO-4608)

[DomGarguilo]

This may be able to me included as part of #2017

[cshannon]

This issue is over 4 years old so closing out. If there is still a desire to do it then it can be re-opened.