Add StrategyOptimization feature

[brunocastroibarburu94]

Problem statement: We want to be able to get optimal values for a strategy given a market, an engine and an objective function

TODO: define how the objective function would look like.

Try to do it as generic as possible

Design comments

• Put parameters in the context as in context.parameters, make it a dotdict, and iterate over the variables after initialization to pick types
• Have a way to pass constraints to individiual variables by name
• At first it should be able to use Real number as parameters

As an expansion on a later ticket add more data types like arrays, string enums etc.

[brunocastroibarburu94]

This endeavour may take a couple of weeks to implement properly. In particular the definition of the objective function for it to be robust. It may be a good idea to leave it for the next student, discuss with @LucianNita on next meeting.

[brunocastroibarburu94]

It will added for release 0.2.0