Move cache.ts to features/ directory.

__tests__/cache.test.ts

@@ -27,7 +27,7 @@
 import {mkdtempSync} from 'fs'
 import {tmpdir} from 'os'
 import {join} from 'path'
-import {restore, save} from '../src/cache'
+import {restore, save} from '../src/features/cache'
 import * as fs from 'fs'
 import * as os from 'os'
 import * as core from '@actions/core'

src/cleanup.ts

@@ -26,7 +26,7 @@
 
 import * as core from '@actions/core'
 import * as constants from './constants'
-import {save} from './cache'
+import {save} from './features/cache'
 import {generateReports} from './features/reports'
 
 /**

src/main.ts

@@ -3,7 +3,7 @@ import * as core from '@actions/core'
 import * as graalvm from './graalvm'
 import {isFeatureAvailable as isCacheAvailable} from '@actions/cache'
 import {join} from 'path'
-import {restore} from './cache'
+import {restore} from './features/cache'
 import {setUpDependencies} from './dependencies'
 import {setUpGUComponents} from './gu'
 import {setUpMandrel} from './mandrel'