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, 17 insertions, 0 deletions

diff --git a/cli/tests/testdata/fmt/regular/formatted3.md b/cli/tests/testdata/fmt/regular/formatted3.md
new file mode 100644
index 000000000..e6e616584
--- /dev/null
+++ b/cli/tests/testdata/fmt/regular/formatted3.md
@@ -0,0 +1,17 @@
+# Hello
+
+```js
+function foo() {
+  return 42;
+}
+
+foo();
+```
+
+```ts
+function bar(): number {
+  return 42;
+}
+
+bar();
+```