feat: support gitee.com as a git provider

[yashin-luo]

Gitee (https://gitee.com/) is a major code hosting platform in China, often compared to GitHub.
Supporting Gitee as a provider will benefit many Chinese developers.

resolves #241

[aguegu]

Good to have this.

[aguegu]

I would provide a script for anyone need this feature before this PR being merged.

import { downloadTemplate } from "giget";

const gitee = (input, { auth }) => {
  const { repo, ref, subdir = '/' } = input.match(/^(?<repo>[\w.-]+\/[\w.-]+)(?<subdir>[^#]+)?(?<ref>#[\w./@-]+)?/).groups;
  const version = ref ? ref.slice(1) : 'main';
  return {
    name: repo.replace('/', '-'),
    version,
    subdir,
    headers: {
      Authorization: auth ? `token ${auth}` : undefined,
    },
    url: `https://gitee.com/${repo}/tree/${version}${subdir}`,
    tar: `https://gitee.com/api/v5/repos/${repo}/tarball?ref=${version}`,
  };
};

const { source, dir } = await downloadTemplate('gitee:<owner>/<repo>', {
  providers: { gitee },
  auth: '<token>',
});

auth is always required for gitee due to traffic control.
For public repos, auth token with only user_info scope would be sufficient.
For private repos, user_info and projects scopes in token would be required.