fix: Small improvements

[vonagam]

• Added missing dependencies.
• Renamed Application type parameters ServiceTypes to Services and AppSettings to Settings. That's the change that does not solve anything and a breakish one (since when somebody augment a module they have to use same names). Can remove.
• Default T to any in Service type (and its relatives), so that you can simply write Service instead of Service<any>. There is some slight difference between Service/Service<any> and Service<any, any> - first one has D as Partial<any>. If this change comes up somewhere, there is a way to add new type later to default D to any if T is any.
• authentication package had a problem with lib/index.d.ts where there was an import of @feathersjs/hooks which is not a direct dependency of the package, fixed by tweaking exports.
• in transport-commons fix types for Publisher (wrong type for context arg) and Application.channel (not supporting an argument of type string | string[]).
• Rename CustomMethod type to CustomMethods and allow to easily specify data and return type or keep it any as it currently is.
• Pass hook enabled methods to enableLegacyHooks (so include custom and filter out unused ones).
• In koa add headers to params (not sure if should be cloned as query is, in express neither query nor headers are cloned).
• In koa add types for feathers props on koa context - feathers and hook.
• In transport-commons and express remove hooks dependency and use correct type for context - it isn't supposed to work with generic hook context, only with feathers one.

[daffl]

These are great, thank you! I think the CustomMethods change makes sense, we'll just have to update the docs. I wonder if there is a better way in TypeScript to do that. We're having a similar problem making service method typings more flexible.