pmc: console configuration and table rendering for new PMC tools

Initializes the terminal rendering code used by the new pmc tools. Then
provides a table abstraction for collecting, sorting and rendering
tables. It provides pretty printed results with typed fields that print
several types used throughout the new PMC tools. By default the fields
are formatted in engineering notation.

Sponsored by: Netflix
Reviewed by: adrian, imp
Differential Revision: https://reviews.freebsd.org/D57775