no-unstable-api-use: better handling of uncalled function with deprecated overload

[ajafff]

/**@deprecated Use the other overload instead.*/
function baz(): string;
function baz(v: string): string;
function baz(...args: string[]) {return args[0];}

baz; // should be no error
setTimeout(baz, 1000); // should be an error

declare function takeNoArgsCb(cb: () => any): void;
declare function takeStringArgCb(cb: (v: string) => any): void;

takeNoArgsCb(baz); // should be an error
takeStringArgCb(baz); // no error if feasible

Proposal: only report uncalled function if it has a contextual type with call signature. The same probably applies to constructor types.