refactor: use argv-iterator

[privatenumber]

• Abstracts argv iteration to an iterator
• Converts flags to getters

[github-actions[bot]]

📊 Package size report   -1.1%↓

File	Before (Size / Gzip)	After (Size / Gzip)
dist/index.d.ts	3.1 kB / 1.0 kB	1%↑3.1 kB / 1.0 kB
dist/index.js	2.5 kB / 1.3 kB	-5.57%↓2.3 kB / -3.04%↓1.2 kB
dist/index.mjs	2.5 kB / 1.2 kB	-5.59%↓2.3 kB / -3.22%↓1.2 kB
Total (Includes all files)	21.1 kB / 8.7 kB	-1.1%↓20.8 kB / -0.9%↓8.6 kB
Tarball size	7.7 kB	-5.33%↓7.3 kB

Unchanged files

| File | Size (Size / Gzip) | | -------------------------------------------------------------------------------------------- | -------------------: | | [`LICENSE`](https://github.com/privatenumber/type-flag/blob/argv-iterator/LICENSE) | `1.1 kB` / `658 B` | | [`package.json`](https://github.com/privatenumber/type-flag/blob/argv-iterator/package.json) | `1.3 kB` / `606 B` | | [`README.md`](https://github.com/privatenumber/type-flag/blob/argv-iterator/README.md) | `10.7 kB` / `3.9 kB` |

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

[privatenumber]

:tada: This PR is included in version 3.0.0 :tada:

The release is available on:

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

Your semantic-release bot :package::rocket: