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/fmt_with_config/c.md b/cli/tests/testdata/fmt/fmt_with_config/c.md
new file mode 100644
index 000000000..012f7e3d4
--- /dev/null
+++ b/cli/tests/testdata/fmt/fmt_with_config/c.md
@@ -0,0 +1,17 @@
+## Permissions
+
+Deno is secure by default. Therefore,
+unless you specifically enable it, a
+program run with Deno has no file,
+network, or environment access. Access
+to security sensitive functionality
+requires that permisisons have been
+granted to an executing script through
+command line flags, or a runtime
+permission prompt.
+
+For the following example `mod.ts` has
+been granted read-only access to the
+file system. It cannot write to the file
+system, or perform any other security
+sensitive functions.