fix: avoid leaked lock files for more than 10 seconds

[DimitarTachev]

Replace the lockfile package in order to depend on modified, instead of created date when checking for stale locks.

Replacing the package, we are able to keep smaller stale values (e.g. 10 seconds) and avoid losing the lock during long-running operations. In this way, when the CLI process crashes (or is killed with SIGKILL), we won't have leaked lock files for more than 10 seconds.

PR Checklist

• The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/CONTRIBUTING.md#commit-messages.
• There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
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• All existing tests are passing: https://github.com/NativeScript/nativescript-cli/blob/master/CONTRIBUTING.md#contribute-to-the-code-base
• Tests for the changes are included.

What is the current behavior?

If the process is killed with SIGKILL (kill -9), the lock files will leak for up to 90 seconds.

What is the new behavior?

If the process is killed with SIGKILL (kill -9), the lock files will leak for 5-10 seconds.