Adds a new operation findDistinct that can give you distinct values of a
field for a given collection
Example:
Assume you have a collection posts with multiple documents, and some of
them share the same title:
```js
// Example dataset (some titles appear multiple times)
[
{ title: 'title-1' },
{ title: 'title-2' },
{ title: 'title-1' },
{ title: 'title-3' },
{ title: 'title-2' },
{ title: 'title-4' },
{ title: 'title-5' },
{ title: 'title-6' },
{ title: 'title-7' },
{ title: 'title-8' },
{ title: 'title-9' },
]
```
You can now retrieve all unique title values using findDistinct:
```js
const result = await payload.findDistinct({
collection: 'posts',
field: 'title',
})
console.log(result.values)
// Output:
// [
// 'title-1',
// 'title-2',
// 'title-3',
// 'title-4',
// 'title-5',
// 'title-6',
// 'title-7',
// 'title-8',
// 'title-9'
// ]
```
You can also limit the number of distinct results:
```js
const limitedResult = await payload.findDistinct({
collection: 'posts',
field: 'title',
sortOrder: 'desc',
limit: 3,
})
console.log(limitedResult.values)
// Output:
// [
// 'title-1',
// 'title-2',
// 'title-3'
// ]
```
You can also pass a `where` query to filter the documents.
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