fix: mark allowTrailingCommas as optional

[GeekyEggo]

When updating from 3.0.1 to 3.3.1, I noticed a breaking change was introduced in #136, specifically with the TypeScript type of ParseOptions.allowTrailingCommas.

C:/git/cli/src/json/schema.ts:105:27
 '{ mode: "json"; ranges: false; tokens: false; }' but required in type 'ParseOptions$1'.

105   const ast = parse(json, { mode: "json", ranges: false, tokens: false });
                              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  node_modules/@humanwhocodes/momoa/dist/momoa.d.ts:66:14
    66     readonly allowTrailingCommas: boolean;
                    ~~~~~~~~~~~~~~~~~~~
    'allowTrailingCommas' is declared here.

This PR updates ParseOptions.allowTrailingCommas to be optional, preventing the introduction of a breaking change.

[nzakas]

Ah good catch. It looks like there's a bunch of unrelated formatting changes in this PR. Can you fix that?

[GeekyEggo]

Oops, my apologies! Those should be resolved now. 🙏

[nzakas]

LGTM. Thanks.