Fix: Apply @minItems and @maxItems on model array (#2170)

fix #2110

Makes sure 

```tsp
@minItems(1)
@Maxitems(5)
model Endpoints is string[];
```
Get applied correctly in openapi3.

common/changes/@typespec/openapi3/fix-min-items-max-items_2023-07-11-16-28.json

@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@typespec/openapi3",
+      "comment": "Fix: Apply `@minItems` and `@maxItems` decorators on model array.",
+      "type": "none"
+    }
+  ],
+  "packageName": "@typespec/openapi3"
+}

packages/openapi3/src/openapi.ts

@@ -1507,9 +1507,7 @@ function createOAPIEmitter(program: Program, options: ResolvedOpenAPI3EmitterOpt
   function getSchemaForModel(model: Model, visibility: Visibility) {
     const arrayOrRecord = mapTypeSpecIntrinsicModelToOpenAPI(model, visibility);
     if (arrayOrRecord) {
-      const arrayDoc = getDoc(program, model);
-      arrayOrRecord.description = arrayDoc;
-      return arrayOrRecord;
+      return applyIntrinsicDecorators(model, arrayOrRecord);
     }
 
     let modelSchema: OpenAPI3Schema & Required<Pick<OpenAPI3Schema, "properties">> = {
@@ -1646,13 +1644,15 @@ function createOAPIEmitter(program: Program, options: ResolvedOpenAPI3EmitterOpt
   }
 
   function applyIntrinsicDecorators(
-    typespecType: Scalar | ModelProperty,
+    typespecType: Model | Scalar | ModelProperty,
     target: OpenAPI3Schema
   ): OpenAPI3Schema {
     const newTarget = { ...target };
     const docStr = getDoc(program, typespecType);
-    const isString = isStringType(program, getPropertyType(typespecType));
-    const isNumeric = isNumericType(program, getPropertyType(typespecType));
+    const isString =
+      typespecType.kind !== "Model" && isStringType(program, getPropertyType(typespecType));
+    const isNumeric =
+      typespecType.kind !== "Model" && isNumericType(program, getPropertyType(typespecType));
 
     if (docStr) {
       newTarget.description = docStr;

packages/openapi3/test/array.test.ts

@@ -86,6 +86,38 @@ describe("openapi3: Array", () => {
     });
   });
 
+  it("can specify minItems using @minItems decorator (on array model)", async () => {
+    const res = await oapiForModel(
+      "Names",
+      `
+      @minItems(1)
+      model Names is string[];
+      `
+    );
+
+    deepStrictEqual(res.schemas.Names, {
+      type: "array",
+      minItems: 1,
+      items: { type: "string" },
+    });
+  });
+
+  it("can specify maxItems using @maxItems decorator  (on array model)", async () => {
+    const res = await oapiForModel(
+      "Names",
+      `
+      @maxItems(3)
+      model Names is string[];
+      `
+    );
+
+    deepStrictEqual(res.schemas.Names, {
+      type: "array",
+      maxItems: 3,
+      items: { type: "string" },
+    });
+  });
+
   it("can specify array defaults using tuple syntax", async () => {
     const res = await oapiForModel(
       "Pet",