[TypeScript] Allow to provide custom naming

Currently, there is only one namingConvention config, and the goal is to keep the current behavior, but also allow developers to separate it.

So this will still work:

namingConvention: module#method

But also allow to provide a default naming, with overrides:

namingConvention:
   default: module#method1
   enumValues: module#method2 
   typeNames: module#method3 

[gaberudy]

I discovered looking at the code there is a way to do a no-change-case, you specify keep as the option for the namingConvention. Here is my config for example:

generates:
  ./src/types/types.ts:
    plugins:
      - typescript-common
      - typescript-server
    config:
      avoidOptionals: true
      namingConvention:
        enumValues: keep

[OneCyrus]

any update on this? the auto renaming broke us. We would prefer a pass-through option as well.