Allow plugins to dictate their preferrred engine and character set

[TheWitness]

Feature Request

Is your feature request related to a problem? Please describe

There are several plugin that desire to have either a character set or table engine other than InnoDB or utf8mb4 due to either performance or space requirements. One good example is the flowview plugin which want's it's analytic tables in 'Aria' or 'MyISAM' and would prefer latin1 as there is no internationalization in those tables. Both changes improve performance of the plugin.

However, Cacti provides no way for Cacti's table conversion functions to regulate that.

Describe the solution you'd like

Provide a callback that allows the plugins to validate the desired engine of their tables.

Describe alternatives you've considered

For the near term, we have modified Cacti starting in 1.2.29 to only convert base tables and not plugin table.

Additional context

There is no real good answer here.

[TheWitness]

Note, this will likely only impact older Cacti installs where we used MyISAM for just about everything early on.