fix: document count period filter (#882)

## Description

Currently the count for the documents table tabs do not display the
correct values when the period filter is applied.

## Changes Made

- Updated `getStats` to support filtering on period

## Testing Performed

- Tested to see if the documents tab count were being filtered based on
the period

## Checklist

- [X] I have tested these changes locally and they work as expected.
- [X] I have followed the project's coding style guidelines.

apps/web/src/components/(dashboard)/period-selector/types.ts

@@ -1,4 +1,4 @@
-export type PeriodSelectorValue = '' | '7d' | '14d' | '30d';
+import type { PeriodSelectorValue } from '@documenso/lib/server-only/document/find-documents';
 
 export const isPeriodSelectorValue = (value: unknown): value is PeriodSelectorValue => {
   // eslint-disable-next-line @typescript-eslint/consistent-type-assertions