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, 11 insertions, 0 deletions

diff --git a/cli/tests/testdata/lsp/deno.fmt.jsonc b/cli/tests/testdata/lsp/deno.fmt.jsonc
new file mode 100644
index 000000000..a0a851731
--- /dev/null
+++ b/cli/tests/testdata/lsp/deno.fmt.jsonc
@@ -0,0 +1,11 @@
+{
+  "fmt": {
+    "options": {
+      "useTabs": true,
+      "lineWidth": 40,
+      "indentWidth": 8,
+      "singleQuote": true,
+      "proseWrap": "always"
+    }
+  }
+}