Support flattening every files under contracts directory

[tornadocontrib]

Describe the feature

Could we support this simple task?

I am doing it with the following, but would be great if it could be supported as a default task

task('flatten:all', 'Flatten all contracts each file under flatten directory')
  .setAction(async (taskArgs, hre) => {
    const allFilesAndFolders = fs.readdirSync('contracts', { recursive: true }) as Array<string>;
    const allFolders = allFilesAndFolders.filter(f => fs.statSync(path.join('contracts', f)).isDirectory());
    const allFiles = allFilesAndFolders.filter(f => !allFolders.includes(f));

    fs.rmSync('flatten', { force: true, recursive: true });
    fs.mkdirSync('flatten');
    allFolders.forEach(f => {
      fs.mkdirSync(path.join('flatten', f), { recursive: true });
    });

    await Promise.all(allFiles.map(async (f) => {
      const contract = path.join('contracts', f);
      const contractTo = path.join('flatten', f);
      try {
        const flatten = await hre.run('flatten:get-flattened-sources', { files: [contract] });
        fs.writeFileSync(contractTo, flatten);
        console.log(`Wrote ${contractTo} contract`);
      } catch (e) {
        // Catching circular contracts
        console.log(`Failed to write ${contractTo} contract`);
        console.log(e);
      }
    }));
  });

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