fix: always use / as path separator in the generated SAS code

[sabhas]

Issue

closes #214

Intent

• sas code requires forward slashes as the path separators in file or folder paths. So replaced os specific path separators with a forward slash /.

Implementation

• created a utility that replaces path separator in a string with /

Checks

• [ ] Code is formatted correctly (npm run lint:fix).
• [ ] All unit tests are passing (npm test).
• [ ] All sasjs-cli unit tests are passing (npm test).
• [ ] Reviewer is assigned.

[sasjsbot]

:tada: This PR is included in version 2.51.1 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: