chore: adds multi-file encrypt and decrypt to web-app

[dmihalcik-virtru]

No description provided.

[github-actions]

If these changes look good, signoff on them with:

git pull && git commit --amend --signoff && git push --force-with-lease origin

If they aren't any good, please remove them with:

git pull && git reset --hard HEAD~1 && git push --force-with-lease origin

[sonarcloud]

Quality Gate failed

Failed conditions
22.3% Coverage on New Code (required ≥ 80%)
8.1% Duplication on New Code (required ≤ 3%)
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

Catch issues before they fail your Quality Gate with our IDE extension SonarLint

[dmihalcik-virtru]

Closing this in favor of #281