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, 4 insertions, 0 deletions

diff --git a/cli/tests/testdata/fmt/regular/formatted4.jsonc b/cli/tests/testdata/fmt/regular/formatted4.jsonc
new file mode 100644
index 000000000..f0f72a6ed
--- /dev/null
+++ b/cli/tests/testdata/fmt/regular/formatted4.jsonc
@@ -0,0 +1,4 @@
+{
+  // Comment
+  "key": "value"
+}