fix(utils/color): Deno does not require permission for NO_COLOR

[ryuapp]

If we run Hono with Deno in node-compat mode, permission to obtain NO_COLOR from env is required in logger and showRoutes.
This PR fixes that and add the Doc.

If you want to reproduce the current situation, try the following ways:

1. Make a directory and add Hono.

mkdir my-app
cd my-app
bun add hono

2. Run this script by Deno.

// deno run main.ts
import { getColorEnabled } from "hono/utils/color"
console.log(getColorEnabled())

3. Deno requests env access to "NO_COLOR".

┌ ⚠️  Deno requests env access to "NO_COLOR".
├ Run again with --allow-env to bypass this prompt.
└ Allow? [y/n/A] (y = yes, allow; n = no, deny; A = allow all env permissions) >

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 96.31%. Comparing base (8f16802) to head (558e869).
Report is 13 commits behind head on main.

Files	Patch %	Lines
src/utils/color.ts	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3306      +/-   ##
==========================================
+ Coverage   96.20%   96.31%   +0.11%     
==========================================
  Files         151      151              
  Lines       15293    15375      +82     
  Branches     2761     2686      -75     
==========================================
+ Hits        14713    14809      +96     
+ Misses        580      566      -14     

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[yusukebe]

LGTM!

[yusukebe]

Hi @ryuapp

I've never noticed that! Good improvement. Thank you!