provide crate fs functions and fix a remove_dir_all bug

[webern]

Description of changes:

commit

    fix bug in make.rs

    If a directory does not exist, remove_dir_all will return an error but
    we do not care if the directory does not exist. Ignoring all errors in
    this case is a simple way to ignore the very common case that directory
    does not exist.

commit

    use crate::common::fs instead of tokio::fs

    Convert tokio::fs call sites to use crate::common::fs for better error
    messages. Also fix a case of blocking io.

commit

    add fs functions for better error messages

    Create simple wrapper functions for tokio::fs that provide better error
    messages.

Terms of contribution:

By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.

[yeazelm]

LGTM!