refactor(commons): use named exports

[fratzinger]

• export every function directly
• improve 'some' & 'every' for early exit
• use 'Object.values' for 'values' instead of 'Object.keys.map' (2x perf)
• isObject: first check for null
• named imports from @feathersjs/commons in every package
• deprecate 'keys', use Object.keys
• deprecate 'values', use Object.values
• deprecate 'extend', use Object.assign
• use type guard for isPromise, isObject & isObjectOrArray
• add jsdoc comments

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