add script to convert Windows to Unix paths

[buha]

Pull Request Description

When sourcing an environment script such as the Xilinx's settings64.sh, PATH entries need to be converted to Unix compatible paths. This script can be used to perform the conversion like this:

source tools/scripts/git-bash-paths.sh /c/Xilinx/Vitis/2022.2/settings64.sh

It's not necessarily specific to Xilinx platform but we're currently using it only for this purpose with possibility to extend it for other platforms.

Tested with Vitis 2022.2.

PR Type

• [ ] Bug fix (change that fixes an issue)
• [x] New feature (change that adds new functionality)
• [ ] Breaking change (has dependencies in other repos or will cause CI to fail)

PR Checklist

• [x] I have followed the Coding style guidelines
• [x] I have performed a self-review of the changes
• [x] I have commented my code, at least hard-to-understand parts
• [ ] I have build all projects affected by the changes in this PR
• [ ] I have tested in hardware affected projects, at the relevant boards
• [x] I have signed off all commits from this PR
• [ ] I have updated the documentation (wiki pages, ReadMe etc), if applies

[buha]

rebase on newsest main because it contains some relevant changes