New Rule: component-method-names

[adidahiya]

(Seeking better rule name suggestions)

I want to enforce a certain naming pattern for callbacks and event handlers:

• methods in props interfaces should use the on prefix -- this refers to code that binds handlers
• methods on component classes should use the handle prefix -- these are the actual handlers that are bound by other methods

[adidahiya]

One more idea:

• Methods that return JSX.Element or JSX.Element[] should be named using the render prefix. For example, renderMenuItems, not getMenuItems. This would require the type checker though, so maybe it should be another rule...

[adidahiya]

Closing due to deprecation timeline #210