refactor: remove getters

[privatenumber]

Getters were made the code elegant, but for the end-user, it wasn't easy to view:

    flags: {
      noCache: [Getter],
      tsconfig: [Getter],
      version: [Getter],
      help: [Getter]
    },

[github-actions]

📊 Package size report   0.2%↑

File	Before (Size / Gzip)	After (Size / Gzip)
dist/index.js	2.7 kB / 1.4 kB	0.9%↑2.7 kB / 0.2%↑1.4 kB
dist/index.mjs	2.6 kB / 1.4 kB	1%↑2.7 kB / -0.44%↓1.3 kB
Total (Includes all files)	22.0 kB / 9.1 kB	0.2%↑22.0 kB / -0.03%↓9.1 kB
Tarball size	7.6 kB	3%↑7.9 kB

Unchanged files

File	Size (Size / Gzip)
dist/index.d.ts	3.3 kB / 1.1 kB
LICENSE	1.1 kB / 658 B
package.json	1.6 kB / 684 B
README.md	10.7 kB / 3.9 kB

_{🤖 This report was automatically generated by pkg-size-action}

[privatenumber]

🎉 This PR is included in version 3.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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