feat(grid/transduce): add transduce function

It uses transducist's transduce, the only difference that it accepts an array of transformers

src/grid/index.ts

@@ -1,4 +1,5 @@
 export * from './functions'
 export * from './grid'
+export * from './transduce'
 export * from './traversers'
 export * from './types'

src/grid/transduce.ts

@@ -0,0 +1,11 @@
+import { CompletingTransformer, compose, transduce as _transduce, Transducer } from 'transducist'
+import { Hex } from '../hex'
+
+export function transduce<T extends Hex, R extends Iterable<T>>(
+  hexes: Iterable<T>,
+  transformers: Transducer<T, T> | Transducer<T, T>[],
+  reducer: CompletingTransformer<R, R, T>,
+): R {
+  const transform = Array.isArray(transformers) ? transformers : [transformers]
+  return _transduce(hexes, compose(...(transform as [Transducer<T, T>])), reducer)
+}