refactor: replace unmaintained sander package with fs-extra

[armano2]

replace unmaintained sander package with fs-extra #918

Description

Motivation and Context

sander package seems unmaintained (not updated for 4 years) and cli is only place where is used.
sander has no type definition

fs promisify and utils.promisify is not supported in targeted node versions (this should be replaced if/when node 8 / 10 will is going to be targeted)

Usage examples

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.