Function rank

rank<In>(r, options?): Link<In, In>
Emits the currently ranked 'highest' value from a stream. Only values exceeding the current highest are emitted.

eg, if we are ranking on numerical value, an input stream of:
```
4, 1, 6, 10, 2, 4
```
Results in the output stream of:
```
4, 6, 10
```
Type Parameters
- In
Parameters
- r: RankFunction<In>
- options: Partial<RankOptions> = {}
Returns Link<In, In>
Example
```
// Rank based on a field
Chains.Links.rank((a,b) => {
 if (a.size > b.size) return `a`; // Signals the first param is highest
 if (a.size < b.size) return `b`; // Signals the second param is highest
 return `eq`;
});
```