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, 0 insertions, 17 deletions

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