Implement textarea component

Co-authored-by: Florian Scholdei<florian.scholdei@cloudogu.com>
Co-authored-by: Laura Gorzitze<laura.gorzitze@cloudogu.com>

scm-ui/ui-forms/src/input/Textarea.stories.mdx

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+import { Meta, Story } from "@storybook/addon-docs";
+import Textarea from "./Textarea"
+
+<Meta title="Textarea" />
+
+This will be our latest Textarea component
+
+<Story name="Default">
+  <Textarea />
+</Story>
+
+<Story name="With Variant">
+  <Textarea variant="danger" />
+</Story>
+
+<Story name="With Custom Class">
+  <Textarea className="is-warning" />
+</Story>
+
+<Story name="With Ref">
+  <Textarea ref={r => {r.focus()}} />
+</Story>
+
+<Story name="With Default Value">
+  <Textarea>
+  value
+  </Textarea>
+</Story>

scm-ui/ui-forms/src/input/Textarea.tsx

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+/*
+ * MIT License
+ *
+ * Copyright (c) 2020-present Cloudogu GmbH and Contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+import React, { InputHTMLAttributes } from "react";
+import classNames from "classnames";
+import { createVariantClass, Variant } from "../variants";
+import { createAttributesForTesting } from "@scm-manager/ui-components";
+
+type Props = {
+  variant?: Variant;
+  testId?: string;
+} & InputHTMLAttributes<HTMLTextAreaElement>;
+
+const Textarea = React.forwardRef<HTMLTextAreaElement, Props>(({ variant, className, testId, ...props }, ref) => {
+  return (
+    <textarea
+      ref={ref}
+      className={classNames("textarea", createVariantClass(variant), className)}
+      {...props}
+      {...createAttributesForTesting(testId)}
+    />
+  );
+});
+
+export default Textarea;