Make cache package a module (#20)

Author: chlowell

.github/workflows/go.yml renamed to .github/workflows/build-and-test-cache.yml

@@ -1,10 +1,14 @@
-name: Build and Test
+name: Build and Test Cache Module
 
 on:
   pull_request:
     types: [opened, reopened, synchronize]
+    paths:
+      - 'cache/**'
   push:
     branches: [dev, main]
+    paths:
+      - 'cache/**'
 
 jobs:
   build_test:
@@ -19,18 +23,21 @@ jobs:
 
       - uses: actions/setup-go@v4
         with:
-          go-version-file: "go.mod"
+          go-version-file: "./cache/go.mod"
 
       - name: Build
-        run: go build -x ./extensions/...
+        working-directory: ./cache
+        run: go build -x
 
       - name: Test
+        working-directory: ./cache
         run: go test -race -v ./...
 
       - name: Lint
         # lint even when a previous step failed
         if: ${{!cancelled()}}
         uses: golangci/golangci-lint-action@v3
         with:
+          working-directory: ./cache
           version: v1.52
           args: -v

extensions/cache/accessor/accessor.go renamed to cache/accessor/accessor.go

@@ -10,7 +10,7 @@ import (
 	"path/filepath"
 	"sync"
 
-	"github.com/AzureAD/microsoft-authentication-extensions-for-go/extensions/cache/accessor"
+	"github.com/AzureAD/microsoft-authentication-extensions-for-go/cache/accessor"
 )
 
 // Storage stores data in an unencrypted file.