feat(fmt): add support for configuration file (#11944)

This commit adds support for configuration file for "deno fmt"
subcommand. It is also respected by LSP when formatting
files.

Example configuration:
{
    "fmt": {
        "files": {
            "include": ["src/"],
            "exclude": ["src/testdata/"]
        },
        "options": {
            "useTabs": true,
            "lineWidth": 80,
            "indentWidth": 4,
            "singleQuote": true,
            "textWrap": "preserve"
        }
    }
}

1 files changed, 46 insertions, 0 deletions

diff --git a/cli/tests/testdata/fmt/fmt_with_config/a.ts b/cli/tests/testdata/fmt/fmt_with_config/a.ts
new file mode 100644
index 000000000..e0f32647b
--- /dev/null
+++ b/cli/tests/testdata/fmt/fmt_with_config/a.ts
@@ -0,0 +1,46 @@
+unitTest(
+	{ perms: { net: true } },
+	async function responseClone() {
+		const response =
+			await fetch(
+				'http://localhost:4545/fixture.json',
+			);
+		const response1 =
+			response.clone();
+		assert(
+			response !==
+				response1,
+		);
+		assertEquals(
+			response.status,
+			response1
+				.status,
+		);
+		assertEquals(
+			response.statusText,
+			response1
+				.statusText,
+		);
+		const u8a =
+			new Uint8Array(
+				await response
+					.arrayBuffer(),
+			);
+		const u8a1 =
+			new Uint8Array(
+				await response1
+					.arrayBuffer(),
+			);
+		for (
+			let i = 0;
+			i <
+				u8a.byteLength;
+			i++
+		) {
+			assertEquals(
+				u8a[i],
+				u8a1[i],
+			);
+		}
+	},
+);